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I agree with your overall point: it most likely does not matter when the values are close enough. However :)

There can be two companies with 100M market cap. Corp A has issued 10M shares @ 10 each, Corp B has 10B shares priced at 0.01

A +/-0.001 change in Corp A share price is just 0.01% and moves the market cap by +/-10k, so probably nothing significant. The same nominal change in Corp B amounts to 10%, or +/- 10M in the company value, which is quite a big deal.

Also I think there may be some money to be made in changes at the 7th decimal place with large enough volume of high frequency transactions.

Because of the way floating point numbers work, you'd get an accurate amount for both cases, as it's really the number of significant figures, not decimals.

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