Hey, I think the more important question that you should be asking yourself is: why are you in business? what do you want to achieve? what are you passionate about?
When i first started out, I was trying to sell anything and everything just trying to make more money. I soon figured out that you end up chasing an empty idea. If you're trying to sell stuff or create a business on something you don't really care about because you're only after the money, you're always going to fail.
The reason being is because you face so many problems in business that if you don't have a strong reason for doing it you'll just give up as soon as something doesn't work.
Likewise, business is about adding value and building a relationship with your customers. If you don't care about the business, the products or the customers, someone who does will always beat you.
I recommend figuring out what you're passionate about, what is important to you, what problems you face in your life and then use those to create a business around it.
There's a bunch of stuff you can promote for money, but you'll never get it because you're doing it for the wrong reasons. Whatever industry or product that you decide to do, you can MAKE it work. It's not about what is "hot" right now, or the economy or whatever, it's about how compelling you are and how good you are at building trust and adding value to your customers/prospects.
(If you want a better explanation of it all, you can check out my website -I've got a free report).
Learn how to strategically use persuasion psychology and online media tactics to market, position & systematise your business: http://www.TheKlausewitzFormula.com