spéculation

Profitable, yielding profit or financial gain.

Interest. Money paid regularly at a particular rate for the use of money lent.

Transaction. An instance of buying or selling something; a business deal.

Money in the form of banknotes and coins, rather than checks or credit cards.

To debit, take money from an account.

To tax, impose a tax on (someone or something).

Costing a lot of money; expensive.

Deficit, the amount by which something, especially a sum of money, is too small.

Expense, money spent on something.

Relating to finance; financial.