Doubling money the old fashion way.

Anything you steal.

>>1076402
Ethereum in a couple of months.
But might result in much more than 100%.

More normie speaking though:
Art is a pretty good bet. Anything that has sentimental value and easily misjudgeable value. Sports things signed by some homo, stained panties of some slut.

Anything where there isn't a clearly defined market value. The liquidity will be nightmarishly low, but that will mean the market can easily gap 100% on these items.

>>1076402

Bull semen

>>1076402
Anything that was being sold 50% below it's value.

>>1076402
you can loan me the money, I will repay it back double in 2 weeks.

>>1076402
blue party hats

Your moms body

>>1076402
Get on Craigslist. Offer to recycle old appliances. 40 bucks a pop, you pick them up . Break down and scrap broken appliances, sell working parts on amazon and eBay. Clean up working appliances and sell them to the poor and landlords.
Profit.