This paper studies the influence of capital flow and trade credit to the production planning problems. That is, when a company starts to produce a certain number of products, its present capital quantity should be no less than the total production cost, but it could delay payment using trade...

This paper considers the capital flow constraint and loss of customer goodwill in the lot sizing problem. That is, when a company starts to produce a certain number of products, its present capital quantity should be no less than the total production cost and unsatisfied demand in a given period...