I should elucidate what I think are the major markers of a bubble.

 

1.) Allocations. 

2.) New business's and expanding business's. Everyone jumping into the pool.

3.) Price increases to slow demand.

4.) Separation of product into winners and losers. Dumping the losers. 

5.) Stock at manufacturers and distributors going out the backdoor.  Literal hijacking of product. 

6.) Mainstream media coverage.

7.) Scalpers buying up all available product in mass market. (This should be #1, actually.) Fights in the aisle. 

8.)  Schools banning it because of disruptions. Fights in the schoolyard.

9.) Everyone insisting it isn't a bubble and it's different this time and that they aren't buying for the money but because they really, really like these: pogs, beanie babies, sports cards, Pokemon cards. Also shouting down people like me for being negative. 

10.) Original purveyors complaining but going all in anyway because they think they'll outsmart the market.  

 

I'll add more as I think of them...