Personally, I think the biggest problem in the world economy is that people make money without contributing anything to society. It defeats the purpose of money, it makes it borderline as bad as theft. Hell, even entertainment, beggars selling tissues, etc, is overall good for society. I mean things like pretty much what finance is about. Many insurance companies, gambling companies.
It depends greatly on the country you're in.
I mean like in Malaysia, I think the economic climate is perfect. Lots of benefits for SMEs. Little to no usury, the banks make money through direct investment instead of playing a loan shark. Business is so great that you see shops everywhere, almost like 1 shop for every 3 houses where I live. There's no conflict between businessmen and 'the people', everyone knows that business brings happiness. Social mobility is superb; you'll find lots of rural sons of laborers becoming professors and CEOs. The only problem is in the 1 party political system, and nearly every problem is caused by politics. Oh, and maybe wages are a bit too low, hard to make enough money to pay for everything, yet nobody is starving/homeless unless they choose to be homeless to buy a nice car.
In Australia, things are also fine and dandy, though you'll see people wanting a change for the sake of change. Problem is that the economy is so damn strong that living costs spike. I'd say that gambling and interest are a bit too high though, and investors are too cautious. It's difficult to start a business because of extreme wages, people who start up a shop are practically adventurers because there's no guarantee of success. But most lower class people can afford almost anything they want, and there's plenty of social welfare.
In the US, well, you guys have said enough about it.