We build a model of tacit collusion between firms that operate in multiple markets to study the effects of trade costs. A key feature of the model is that cartel discipline is endogenous. Thus, markets that appear segmented are strategically linked via the incentive compatibility constraint....

In oligopolistic industries, increased cost saving opportunities via offshoring have a moderating effect on trade unions. In order to discourage mobile firms from leaving the country, unions accept lower sector wages. In effect, the negotiated wage becomes independent of workers' bargaining...