World Bank

By Friday evening, the heads of the world's 20 biggest economies -- from the US to South Africa, encompassing 85 percent of global economic activity -- will have dined, met, lunched, met again, and made their pronouncements.

If history is any judge, there may not be much in the way of immediate or lasting results.

The leaders of 20 of the world's biggest economies committed to a laundry list of executive pay reforms for financial firms, including limiting bonuses to a portion of total net revenues and linking them tightly to share prices. But don't count on sweeping mandates from regulators just yet.