Why is it necessary for the masses to consume transport and other products? Does efficiency of production lead to oversupply? (Brave New World)

If people don't buy the products that companies produce in large amounts, there is going to be a halt in the economy. For that reasons, people have to buy and it triggers consumerism. The system is made in a way that people need new products instead of using the old ones. And students made to believe that transportation is important because it keeps factories work better. The following small excerpt from Brave New World shows this effect:

A love of nature keeps no factories busy. It was decided to abolish the love of nature, at any rate among the lower classes; to abolish the love of nature, but not the tendency to consume transport. For of course it was essential that they should keep on going to the country, even though they hated it. The problem was to find an economically sounder reason for consuming transport than a mere affection for primroses and landscapes. It was duly found.

"We condition the masses to hate the country," concluded the Director. "But simultaneously we condition them to love all country sports. At the same time, we see to it that all country sports shall entail the use of elaborate apparatus. So that they consume manufactured articles as well as transport. Hence those electric shocks." "I see," said the student, and was silent, lost in admiration.