In my view, the current global economic crisis is the result of rampant global capitalism.
Industry used to employ 100's of millions of people, albeit at minimal wages, in order for the owner of the means of production to become grotesquely wealthy at their expense. Now expand this over a global scale, millions of factories making the products that we all use on a daily basis, without a second thought about who made it or the conditions they were forced to work under. Now pay all of these hundreds of millions of people a paltry wage, so paltry in fact that none of them can any longer afford to buy the products they have all contributed to making.
Now bring mechanisation into the picture! You've just made millions unemployed as their jobs are now being done by a robot, that can work 24/7, 365 days a year without a break, holiday or needing sick pay. The owner of the means of production still needs to charge the same for the product as he has to repay the banks for lending him the money to buy the robots, but he/she is still getting richer, until one day he realises that as all of the other great production houses have done the same, there are no longer any customers that can afford to buy their goods.
This factory can no longer sell their products, as all of the others, they all start to go bust and they can't afford to repay the bank loans.
Meanwhile, lots of the previously employed people are now on the dole and they have defaulted on their mortgages and the homes are reposessed, thus pushing down the price of homes and making the banks jittery about lending money to anyone at all.
You still have a very small amount of incredibly wealthy people, multi billionaires that have become rich at the expense of the other 6 billion of us that have been forced to pay over the odds for just about everything.
Result - the current global economic crisis.
But Socialism/communism can't work either as each of these political strategies rely upon altruism and absolute honesty to work as they should, but us weak humans are not that way inclined, sadly, many of those that end up in the seats of power are corrupt and far from altruistic.
Where do we go from here? Answers on a postcard please to your nearest honest, altruistic and incorruptable politician.