The correct answer to this open question is the following.
Unfortunately, you forgot to include the reading. There is no reading here, no text, excerpt, or a link to it.
However, although you forgot to attach the reading, we can help you commenting an idea based on our knowledge of the topic.
It is correct to say that it is relatively easy that entrepreneurs can enter and leave markets in a free enterprise system of the United States. Indeed it is one of its advantages.
However, the same affirmation cannot be applied to a country with a command economy because in a command economy the conditions are in total opposition to a free-market economy where individuals promote capitalist ideas to invest money and create companies in order to be rich.
In a command economy, it is the state the one that owns the means of production. The central government decides the kind of products to be produced, the price of the products, how to produce the goods, and the amount that is going to be produced.
The implications that this has for the law of supply in that country is that it cannot be considered because the law of supply/demand is only valid in a free market economy, not in a command economy.
