An Integrated Model for a Two-supplier Supply Chain with Uncertainty in the Supply

The objective of this paper is to study an integrated two-supplier supply chain whose suppliers are nreliable. an unreliable supplier is alternative between available (on) and unavailable (off) states which are considered to be independent exponential variables. the suppliers apply a continuous review policy and the retailer uses an adapted continuous review base on an(r,q) policy. transportation times are constant and lead times are non-zero random variables. the retailer faces independent poisson demands. using the idea of the one-for-one ordering policy, we implicitly incorporate the distribution function of the random delay for obtaining the value of the expected costs of system. finally, resorting to a dozen of sample problems, we show that the average cost reduction in our inventory system is at least 3.69% and at most 36.95% comparing to the one with only one supplier.