Credit is a loan extended or (sometimes) taken by, for example, delayed payment of an invoice. definition from economist.com
Credit constraints in general equilibrium: experimental results. Bosch-Domenech, A. and Silvestre, J. (1997) Economic Journal 107, 1445-1465 http://ideas.repec.org/a/ecj/econjl/v107y1997i444p1445-64.html