TEL AVIV (Reuters) - Tens of thousands of Israelis marched for lower living costs on Saturday in what protest leaders called "a moment of truth" for a movement that has mounted pressure on PM Netanyahu to take on sweeping economic reform. "An entire generation wants a future," read one banner as demonstrators flooded the streets of Tel Aviv, Haifa and Jerusalem, shouting "the people demand social justice." "Tonight is the pinnacle moment of a historic protest," Amir Rochman, 30, an activist said. The grassroots movement has swollen since July from a cluster of student tent-squatters into a diffuse, countrywide mobilisation of Israel's middle class.