Everything has its own importance. Well, if you really choose science and became a engineer one day, Opened up a company and by luck your company grew making billions. But, to run a company you need to know commerce, what are shares,stock exchange, statistics, billings, accounts and many such stuff related to money or some what like that. without commerce, never think of becoming a billionaire. without science, never think of changing the world, moving to mars , or, many more inventions. you can't decide you want a ass or a dick, both are important.