Don't open a shop unless you like to smile.
— Chinese Proverbs

Beware of little expenses. A small leak will sink a great ship.
Benjamin Franklin shop quote

The probability of life originating from accident is comparable to the probability of the unabridged dictionary resulting from an explosion in a printing shop.
— Edward Conklin

Everyone lives by selling something.
— Robert Louis Stevenson

There are very honest people who do not think that they have had a bargain unless they have cheated a merchant.
— Anatole France