The hook:
Do you know what are some very profitable market so you can have a very high-profit margin? All of you know Apple is one of them by selling iPhone and iPad. Many service company has very high-profit margins as well. However, many of you may not know one of the very profitable business, which may give you more than 500% profit margin. Today, I am going to introduce you to this market-personal audio market, specifically high-end headphone market.