“You shall not have in your house two kinds of measures, a large and a small.” (Deuteronomy 25:14 ESV)
Imagine that you have a side business selling homemade spaghetti sauce. Your price is $4 per quart jar of sauce. When you sell your jar of sauce, how much money do you expect? I know the math is tough, but you expect $4.
How much sauce should the buyer expect? Right, one quart. Not 3/4 of a quart. Not 7/8 of a quart. The deal was $4 for one quart of spaghetti sauce. Evidently cheating people was as much of a problem back in bible days as it is today. They had one “quart” to sell with and another “quart” to by with, cheating when they bought and sold. Today wecall it deceptive packaging, or bait and switch, or a scam.
God calls it something else…
“A full and fair weight you shall have, a full and fair measure you shall have, that your days may be long in the land that the LORD your God is giving you. For all who do such things, all who act dishonestly, are an abomination to the LORD your God.” (Deuteronomy 25:15-16 ESV)