That Wikipedia article seems to talk about company stores a lot, actually.
> […] even in [locations] that were not [poor], workers paid in scrip had little choice but to purchase goods at a company store, as exchange into currency, if even available, would exhaust some of the value via the exchange fee. With this economic monopoly, the employer could place large markups on goods, making workers dependent on the company, thus enforcing employee "loyalty".
> […] even in [locations] that were not [poor], workers paid in scrip had little choice but to purchase goods at a company store, as exchange into currency, if even available, would exhaust some of the value via the exchange fee. With this economic monopoly, the employer could place large markups on goods, making workers dependent on the company, thus enforcing employee "loyalty".