Deuteronomy 25:13-16

You shall not have in your bag two kinds of weights, large and small.¹ You shall not have in your house two kinds of measures, large and small. You shall have only a full and honest weight; you shall have only a full and honest measure, so that your days may be long in the land that the Lord your God is giving you.² For all who do such things, all who act dishonestly, are abhorrent³ to the Lord your God.

1 In other words, don't cheat people economically.

2 Honesty is connected to a long life in the land.

3 Economic fraud is “abhorrent” to the Lord.

Take-home: Economic cheating of others is forbidden.