What Determines Demand of the Customers and Supply of the Companies?

There are so many factors and circumstances that could affect a seller's willingness or ability to produce and sell a good. One of the things is the condition of production, the other one is I suppose one of the most important factors its technology, which means if there is a technological improvement in one good’s production and quality then demand increases. The other one not less important factor is advertising, that is huge factor to increase your goods popularity that increases demand, so company has to increase supply. …