In market economies, firms rarely worry about the availability of inputs to produce their products, whereas in command economies input availability is a constant concern. This is because multiple choice in command economies, no market-pricing mechanism exists to incentivize resource suppliers to increase resource availability when a shortage occurs. in market economies, buyers of inputs can choose what price they are willing to pay for the inputs. in market economies, buyers of inputs know that consumers want to purchase the product. in command economies, input availability is determined by central planners who may not correctly respond to consumer demand