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Re:Coinbase Debit Card by patio11 on Friday April 12, 2019 @05:07AM (#19643264)
Well stocks can't be sold in tiny tiny fractions.

n.b. Not true; a lot of retail brokerages are happy to deal in fractional shares. A common use case is implementing dividend reinvestment, where you might have the 10 shares you own issue a dividend entitling you to .005 shares; many retail brokerages can trivially support this.

The "How?" is potentially interesting: over the entirety of a broker's book of business, there are a lot of holders of e.g. SPY, so the broker (or their internalizer) just buys (pick a number) 713 shares, assigns fractions correctly, and keeps a tiny bit of the last share on their own account. This comes out in the wash, because retail customers are extremely lucrative to service at scale, and having to be ~$100k long various publicly traded equities to keep the tollbooth running is cheap at the price.

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