Liars want others to believe their lies so they gossip and slander. Extrapolate... media-based mass formation psychosis as a key skill and tool of deceptive power; normalise the lie.

Cheats who run a goldsmith can print out a few extra gold receipts without anyone really noticing or caring, and exchange these for goods. Extrapolate... debt-based slavery.

Frauds will sell you a potion that harms you but temporarily relieves some symptoms of disease, claiming it gives health. Extrapolate... the entire petrochemical pharmaceutical industry.

Add these together and you have the modern world.