In a market economy, entrepreneurs have more freedom in how they run their business as decisions are made individually by consumers and producers. In a command economy, the government makes most production and consumption decisions, giving entrepreneurs less choice. Supply and demand affect entrepreneurs' product decisions and costs, as they are motivated to supply more of a product at a higher price that consumers are willing to pay. Fixed costs must be paid regardless of production levels, while variable costs change with output. Opportunity costs and comparing marginal costs to marginal benefits influence business decisions.