US: Basics of taxation of stocks
E.g. I buy 1 stock unit for $100.00 and sell it later for $150.00 => income taxes arise. Correct. You pay tax on your gains, i.e.: the different between net proceeds and gross costs (proceeds sans fees, acquisition costs including fees). I buy 1 stock unit for $150.00 and sell it later for $100.00 => no income taxes here. Not correct. The loss is deductible from other capital gains, and if no other capital gains - from your income (up to $3000 a year, until exhausted). Also, there are two different tax rate sets for capital gains: short term (holding up to 1 year) and long term (more than that). Short term capital gains tax matches ordinary income brackets, whereas long term capital gains tax brackets are much lower.
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US: Basics of taxation of stocks

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E.g. I buy 1 stock unit for $100.00 and sell it later for $150.00 => income taxes arise. Correct. You pay tax on your gains, i.e.: the different between net proceeds and gross costs (proceeds sans fees, acquisition costs including fees). I buy 1 stock unit for $150.00 and sell it later for $100.00 => no income taxes here. Not correct. The loss is deductible from other capital gains, and if no other capital gains - from your income (up to $3000 a year, until exhausted). Also, there are two different tax rate sets for capital gains: short term (holding up to 1 year) and long term (more than that). Short term capital gains tax matches ordinary income brackets, whereas long term capital gains tax brackets are much lower.