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

• 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 command economies, input availability is determined by central planners who may not correctly respond to consumer demand.
• in market economies, buyers of inputs know that consumers want to purchase the product.