Attempt To Resolve This Intractable Issue From Throughout History

The key is to treat each transaction as distinct, for example, if a guy purchases a horse for $60, sells it for $70, buys it again for $80, and then sells it again for $90.

10 is equal to -60 + 70 + 80 + 90. The man’s profit totals $20 since he earned $10 on each transaction.

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