A nice article but I see a few flaws. First of all if the distribution of LEGO sizes/prices is increasingly skewed it is better to either split the sample or look at medians or rolling medians than averages. Secondly, this is a perfect case to run a regression panel regression with time dummies to see both the impact of time and the impact of size on the prices.
Since the dawn of the Transformers in 1984, the spunky little Autobot called Bumblebee has been a fan favorite. Why? He was the underdog. He was small, and he was one of the weaker Transformers, but his heart was huge and he showed great bravery on the battlefield. As a result, he was an admired and gentle friend not only to humans, but to his peers as well. And it didn’t hurt that his alternate mode was a cute little yellow Volkswagen Beetle.
Offered as part of a Lucky Draw campaign in August 2004, this extremely rare version of Masterpiece Convoy is almost entirely vacuum-metalized gold, lacking any other painted detail or stickers. The parts which are not viable are molded in a flat golden plastic; the only exceptions are its rubber tires, the core of the Matrix and the energon-axe, which remain black, blue and orange, respectively. Whether or not the figure was intended to evoke Optimus Prime's entirely-golden appearance in the cartoon episode "The Golden Lagoon", when he was coated with electrum, is unknown; given that entirely chroming a figure gold is a fairly standard deco for Lucky Draw figures, it may just be happy coincidence more than anything else.

In the animated series, Optimus is able to fire short-range optic blasts, project holographic maps, and deploy hydro-foils, designed by Wheeljack, to traverse bodies of water with ease. In the animated series, Optimus was also given the ability to retract his right hand unit and replace it with a glowing axe.[7] Across the assorted continuities of the original Transformers universe, there have been various interpretations of Optimus Prime. One of Prime's most notable characteristics over all continuities his unswaying commitment to leadership by example. The animated series's version of Optimus Prime is depicted as a straightforward, wise, and upbeat battlefield general. Additionally, the animated series's version of Optimus dislikes rap music, putting him at odds with music-loving characters like Blaster and Jazz. In the Marvel Comics series, in addition to these characteristics, Prime is secretly plagued by self-doubt and a conflicted sense of pacifism that often makes him an extremely reluctant warrior.
Available with Grimlock, this Optimus Prime is a redeco (or possibly a repaint) of the figure above, featuring extra paint applications on the chest and thighs, and he features a different flame pattern on his side doors. His Autobot insignia is now tampographed on his right arm. The cyberglyphs on his front hood is confusingly translated as "PRIME". The 2-pack also comes with a card, which the glyphs being decoded as "DINOBOTS". Optimus Prime and Grimlock also saw release as a Toys"R"Us Japan exclusive, making this Optimus Prime redeco/slight retool to be first sold at Japanese markets.

Prime comes with all the accessories of his previous release, although his ever-changing ion blaster is now somewhat confusingly cast in blue plastic. He features one major additional accessory: an electronic display base sculpted with the image of the Matrix and the Autobot insignia. Pressing the insignia's crest triggers a series of electronic soundbytes, mostly quotes from the movie recited not by original actor Peter Cullen, but by Hasbro's in-house actor, Ron Hayden: "Autobots, transform and roll out!", "I want you to make a special run to Autobot City," "Megatron must be stopped!", "All we need is a little energon, and a lot of luck," and two samples of the classic transformation sound effect, one ascending, one descending.

The single carded release of Optimus Prime is a redeco of Revenge of the Fallen Legends Class Optimus Prime, exclusive to Walmart in the US and Asda in the UK. Deco changes included in this toy are the top half of the knee armor's blue being omitted and an Autobot insignia tampographed on the left knee, and similar to the Legends Class Power Armor Optimus Prime: the red arms, and the abdomen was replaced into blue.
Within G.I. Joe's headquarters, Optimus found Doctor Venom controlling a robotic suit made out of the remains of both Bumblebee and Soundwave. The battle between him and the Joes spilled out into the open and into another battle, where Decepticobra was attacking the United Nations. As more factions joined the brawl, Optimus yanked Bumblebee's components free from Soundwave's body and took to the skies, back to Cybertron. Expelled from the Garden There, he was able to reunite Bumblebee's body with his head. Headmasters
QT-M Optimus Prime is a redeco of the GT-R Optimus Prime mold in the colors of the Transformers-sponsored Nissan GT-R used by the Team Mach racing team (a vehicle previously used as the base for non-toy character Mach Five Racing Prime). Like Transformers GT's Safety Prime, this toy was a collaboration with the Super GT racing series and was given away free to young children who attended TakaraTomy-sponsored "Kids Walk" events held by Super GT in the fall season of 2015.
Rodimus and Cyclonus appear together in the story Wreckers: Finale Part II from 2007. During the invasion of Cybertron, Cyclonus and Rodimus come to final blows, fighting each other to a stand-still. Both severely wounded, Cyclonus is about to kill Rodimus when the Predacon Rotorbolt arrives and kills Cyclonus for betraying him. Rodimus then helps Cheetor to drain the power of the Divine Light from Cryotek. When Rodimus is dying from wounds he received battling Cyclonus, Tigatron is unable to save the former Autobot leader, having given up the power of the Vok to save the Predacon Fractyl.[7]
In the final episode of Transformers: Cybertron, Optimus Prime proposed a new Space Bridge project using the power of the four Cyber Planet Keys and the four great Cybertronian ships. Many Autobots and former Decepticons joined in the project. Jetfire was left in charge of Cybertron as Optimus Prime led the Atlantis with the Earth Cyber Planet Key, joined by Red Alert, Safeguard, Scattorshot, Leobreaker, Menasor, and Heavy Load.
A Mega Super Collection Figure of Prime in his "normal mode" was released a few months after the first figure. He came with a translucent blue Star Saber, and a much larger version of the Convoy Gun accessory, creating a sense of comparative scale, even though he's the same height as the Super Mode figure. Like the Super Mode figure, only his right fist has a peg-hole in it, so he can't hold both weapons at once.

Optimus Prime was originally known as Orion Pax, a police captain from Rodion. An encounter with a pre-Decepticon Megatron would change the course of his life, teaching him that freedom was not just the right of all "civilised" beings, but of all sentient beings, and causing him to publicly reclaim the name "Autobot", previously used only at Cybertronians as a derogatory term, before the corrupt Senate.
Entertainment Pack Optimus Prime is a slight redeco of the SDCC figure, with some deco differences between the SDCC release; this version has gray windows instead of blue and is missing some of the silver deco on the helmet and roof/feet, as well as the yellow paint on his lights. His midriff is also darker. Optimus also comes with a similarly-scaled Megatron and PVC figurines of Jack Darby, Miko Nakadai, and Raf Esquivel.

Transformers: Energon introduced several new concepts to the toy line. Two new sub-groups, the Omnicons and Terrorcons, joined the fray, representing smaller factions of the Autobots and Decepticons respectively. The smaller toys in these sub-groups came with Energon weapons that could be used by the larger Autobots and Decepticons, along with Energon chips that could be fastened to the larger figures to enhance their power. Energon weapons and chips came in a variety of colors of translucent plastic. Many Autobot figures in the line were able to combine with a partner to form a larger robot through the "Powerlinx" process. The Decepticons were designed instead with alternative "attack modes". While no longer the focus of the line, there were several Mini-Con releases in Energon as well.
Optimus Prime is a redeco of Revenge of the Fallen Optimus Prime with predominately red forearms and red/silver thighs, which it was meant to be a Generation 1-inspired deco. He comes bundled with redecos of The Fallen, Megatron, Jetfire, and Starscream in a Kmart-exclusive five-pack. To date, this is the only Hasbro release of this figure that acknowledges the combining feature between Jetfire and Optimus Prime.
The color scheme of this special redeco of Super class Optimus Prime was decided through a colouring contest held in the December 2004 issue of TV Magazine, in which entrants coloured in lineart of Prime in the scheme they wanted to see. The winning entry rendered Prime in a... distinct palette of grey, cream, dark red, and purple chrome, with blue, white, and yellow drones. It was limited to only ten pieces, making it one of the rarer Transformers toys in existence.
Optimus Prime is primarily voiced by Peter Cullen in most of his incarnations, who voiced him in the original series. Following the production of the 2007 film, Cullen reprised his role for the sequels and supporting media and would even voice Optimus in later series such as Transformers: Prime. Optimus has been voiced by a number of other voice actors in other series such as Neil Kaplan, Garry Chalk, and David Kaye in the series Transformers: Robots in Disguise, Unicron Trilogy, and Transformers Animated, respectively.
Standing only two-and-a-quarter inches tall, Smallest Transforming Transformers Optimus Prime was the smallest fully transforming G1 Optimus toy for a while, at least until the release of his chubby super-deformed Q-Transformers versions. He features an accurate transformation sequence based on the original full-sized toy, replacing the detachable hands with actual sculpted fists, and even including a tiny version of his laser rifle. Unsurprisingly, he also has little articulation and is only capable of moving his arms and legs.
4. Collectability/Internet/Ebay: While Lego has always been a somewhat collectible product, the age of the internet has increased the collectability of Lego. Nostalgic adults came together on the internet to trackdown and re-acquire sets from their child hood. I think Lego has embraced this as evidenced by large limited edition sets aimed at the adult market. This is also evident in the increase in tempo of development of sets and themes that drive the collector to want to buy more and more; which overall is good for Lego. In the past, an individual set and theme seemed to have more life than they do now.
Produced by the Chupa Chups lollipop company, this small version of Prime is essentially a battery-powered "holder" for lollipops, which fit behind his head and are spun around by a motor that activates when his pelvis is pressed. Prime has articulation in his shoulders, and his fists feature small holes that allow him to hold and store two more lollipops, in addition to the strawberry sucker he comes with. Weirdly, his Matrix compartment is open instead of having the grill front-and-center.

A non-transforming model kit of Optimus Prime by Takara Tomy, sold exclusively in Japan. The kit comes with a pre-assembled inner frame that features a high rate of poseability similar to Master Grade Gundam model kits. The kit comes with two swords and two different sets of attachments for them: one set for the forearms and the other to replace the hands. Pre-ordered units of the first batch came with battle hooks.[138]

The toy itself is a mix of different versions. The cab has the safety modifications, including the shortened smokestacks and longer missiles (and thicker rifle), but also has the modified hitch of the 2011 Chronicle DOTM two pack. Meanwhile, the trailer is the lighter grey version from the 2008 Universe release. This version also seems to suffer from mold deterioration.
Following the battle, Prime began to experience subconscious urgings, leading both the Autobots and the Decepticons to the Arctic Circle. When they arrived, Shockwave was there to arrest them as war criminals. Shockwave had succeeded in ending the war on Cybertron, but Prime soon fell in with a rebel Autobot group that had discovered Shockwave had greater agenda. Rallying transformers across Cybertron to the cause, Prime faced Shockwave, but was defeated and had the Matrix ripped from him and used to activate Vector Sigma. Before Shockwave could make full use of the mega-computer's data, however, Ultra Magnus, Prime's brother, arrived and bested him. The injuries Prime took during this conflict necessitated a prolonged restoration period in stasis, but Dreamwave's closure meant that Prime never appeared in their pages again.
Minor note: Powermaster Prime's animation model as used in the commercials and as a character guide for the Marvel comics is a composite of the second and third designs. The body of the model is actually a straight tracing of the concept lineart for the third version (including its different rifles and twin faux shoulder stacks), with a slightly simplified drawing of the second version's head drawn on top.
"Special Edition" Optimus Prime is a redeco of the Classics multi-pack toy, featuring some minor paint detail changes, bluer translucent plastic, darker and cooler gray plastic, and darker metallic flake red and blue plastic, with his (previously black-only) rifle body most notably now being cast in both blue and black plastic. He came in special "book box" style packaging with black-and-white boxart, and was only available at retail in Australian and Asian markets. North American customers could later buy him via Hasbro Toy Shop.
The lowest priced toys in the Armada line were three-packs of Mini-Cons. Each larger price point consisted of an Autobot or Decepticon who came with a Mini-Con partner. Mini-Cons could be used to unlock a variety of features on each larger robot, such as firing weapons, electronic lights and sounds, or alternate modes. Some three-pack Mini-Cons combined into other forms or had additional features. According to the storyline, Mini-Cons also enhanced the power of other Transformers, giving incentive to collect as many of them as possible.

Unlike previous Convoy toys, the cab section did not separate from the trailer, instead forming the arms of his imposing 12-inch tall robot mode. He lacks any sort of leg articulation in this mode, but his battery powered treads can provide him with locomotion. Star Convoy's chest can open to reveal a control center for Micromaster figures such as his partner figure Hot Rodimus to ride in.
I you can get an official reissue for around the same price, do it. I lucked out and got an opened but mint Encore for $50 last week but you'll be getting lucky that way. All Hasbro reissues have short smokestacks and long stacks are harder to get separate to swap out. Average price for a Japanese reissue is around $100 opened. If you are on a budget and the kid doens't care about slight issues, the $40 KO would be the better option.
On a mission with the Triggerbots to stop Megatron from claiming the Underbase, Prime was forced to jettison the massive databank into space to prevent anyone from acquiring its power. With this action, he proved his wisdom and skill to the Autobot Council of Elders. He continued to move up in rank, eventually becoming the field command over the Autobot armies.

This retool of Revenge of the Fallen Leader-Class Optimus Prime features the head from Buster Optimus Prime and has had his blades replaced with semi-articulated Battle Hooks for face-destroying action! He has a darker paint job and sports black splotches on his body and head to signify battle damage. However, due to these extra "battle damage" paint applications, some other paint applications that were present on the Revenge of the Fallen release were omitted. He also sports a new voice box in robot mode, replacing the infamous "I am Optimus Prime!" with "We must stop the Decepticons!" The international release, however, retains the same abbreviated "Optimus Prime" sound clip as the original release. To the annoyance of many fans, this version was the main version released just about anywhere outside the United States (all of Canada, Latin America, Europe, and Asia). The box also mentions racing sounds, which may or may not be referring to the button-activated diesel engine noises carried over from the Revenge of the Fallen version of the figure.
The cab transforms into the robot mode of Optimus Prime himself, with the addition of a pair of removable blue fists that plug into his headlights. The fists themselves do not store anywhere in vehicle mode, but can fit easily in Prime's opening chest compartment (originally designed to accommodate two Diaclone driver figures). Prime is armed with a black laser rifle that, due to design, he cannot hold straight.
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