Reuters: Italian Prime Minister Silvio Berlusconi said on Sunday oil-consuming countries should meet to fix a maximum price they are prepared to pay for oil, warning otherwise they would have to invest heavily in nuclear power. Denouncing the “unfair” movement of wealth from consumer nations to oil-producing countries and the “exponential” rise in prices, Berlusconi issued what he said was a threat to oil exporters, saying his proposal for a meeting had the approval of …