company store

noun1

1. •
   A retailer of provisions and general merchandise, owned by a firm which operates a mine or other industry nearby, and at which the firm's employees are required to shop, to pay high prices, and to make payments through payroll deductions or a truck system, typically resulting in the accumulation of considerable employee indebtedness.

   • You load sixteen tons what do you get— Another day older and deeper in debt. Saint Peter don't you call me 'cause I can't go; I owe my soul to the company store. — 1946