What is Maines main products?

Answer 1

Walmart's Main Product is Their Position in the Market

Walmart has become a leader in the "big box" retail market. Supplying thousands of products to a consuming market, Walmart has focused on providing lower cost items at advertised bottom-end prices.

To the consumer, Walmart is known as the place to go when you need just about anything, and want to be assured that you are paying the lowest price. The consumer belief may in fact be illusion. Not all products at Walmart are the cheapest price a shopper would ever pay. Their job as a business is to be sure that the items they promote are the best price possible for the consumer.

Their main product: price perception.