Basically the title. How do stock prices fluctuate by less than a cent if dollars are only normally broken down as far as cents? I routinely see prices for some stocks go up or down by this little.
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Most people are trading stocks in lots of at least 100 shares, so pricing them in 0.0001 means a lot of 100 shares will change in price by $0.01. If one trades an odd lot with a fractional penny price, they would presumably round the final price (probably unfavorably to the customer).
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