What are the most profitable industries?

What are you good at & enjoy doing? How much start up $$ do you have? I think one big thing that would do good now could be internet marketing. Like say someone wanted to direct people to there website, they could hire you to do it for them. Or to find them referrals. This could be a business with small or no start up cost. For instance, if someone hired you to get them referrals, you could advertice on free places for them, or have some paid-to-read emails sites were you can pay per referral. If you are good at things like that as well as being patient & willing to put the time into doing it, you could do well at that. Are you good at finding the not so expensive knock offs of expensive perses? Like if you can find some Loue Vaton purses that look great but arent as expensive, alot of people buy those. But it has to be something that you are good at & enjoy doing to be successfull