buying interest and purchasing power

1. create a product that "desirable (an interest to buy)" someone is better than making a myriad of products that many people have "purchasing power" of the product, as someone who has "purchasing power" will certainly not buy "the product", because "these people" are not interested (do not have interest in buying) of the product, but the product is marketed when "demand (an interest to buy)" by a person no matter how expensive the product will still be bought even if someone does not have the purchasing power of the product. (2.) good for manufactured products are products that "desirable(an interest to buy)" by the buyer and the buyer has a "purchasing power" of the product.