prices will have risen since you were last here.
Argentina's economy is doing well but all the eggs are in one basket - soy. If the commodity market dries up, there is no cushion here. When/if it will is subject to considerable debate but it's my opinion that any country that doesn't have a diverse economy is due for a reckoning at some point.
As to why companies are pulling out - there are a million valid reasons. Incredibly high corporate taxes, incredibly difficult employment laws, government intervention (esp in foreign companies), untrustworthy, expensive and cumbersome banking systems and regulations, high cost of doing business here, constantly changing laws, etc.
The big boys are taking their toys and going to Brasil, Chile or Uruguay. The smaller foreign companies are here but quite a few I know are sunsetting their business or simply not investing more.