In which of the following economics system is the consumer referred to as ‘The King’?

In a Free Market economy, the consumer is often referred to as "The King". This is because in a free market economy, the consumers play a crucial role in determining the supply and demand of goods and services. Since the consumers have the power to choose what to buy and what not to buy, they indirectly control the production and distribution of goods and services. Therefore, producers try to cater to the needs and wants of consumers to attract them to buy their products, leading to competition, innovation and efficiency in the economy. Hence, the saying "The customer is always right" and consumers are often referred to as "The King".