Supply uncertainty can take several forms,including yield
uncertainty, in which supply is always available but the quantity
delivered is a random variable(see,e.g., Yano and Lee,1995), and
disruptions, in which the supplier experiences failures during
which it cannot provide any product.This paper is concerned
with disruptions.(Disruptions may be considered as a special case
of random yield in which the yield variable is Bernoulli;however,
most random yield models assume continuous iid random vari-
ables and are not immediately applicable to disruptions.)See
Snyder et al.(2014), Atan and Snyder(2012), or Vakharia and
Yenipazarli (2008) for reviews of the literature on supply chain
disruptions.