Which change is illustrated by the shift taking place on this graph? a decrease in supply an increase in supply o an increase in demand o a decrease in demand

Emery pharmaceutical uses an unstable chemical compound that must be kept in an environment where both temperature and humidity can be controlled. emery uses 825 pounds per month of the​ chemical, estimates the holding cost to be 50​% of the purchase price​ (because of​ spoilage), and estimates order costs to be ​$48 per order. the cost schedules of two suppliers are as​ follows: vendor 1 vendor 2 quantity price/lb quantity price/lb 1-499 $17 1-399 $17.10 500-999 $16.75 400-799 $16.85 1000+ $16.50 800-1199 $16.60 1200+ $16.25 (a) what is the economic order quantity for each supplier? (b) what quantity should be ordered and which supplier should be used? (c) the total cost for the most economic order sire is $