Emerging markets are the place for investment bankers to wheel and deal during the next couple of years, as bankers in Asia, the Middle East and Latin America earn an increasing share of investment banking revenue.

Emerging markets share of investment banking revenue has increased both in percentage share and total value over the past few years. In 2005, investment-banking revenue from emerging markets accounted for almost $40 billion, or 16% of the global investment-banking revenue total. Those figures increased to just over $78 billion, a 21% share of the total in 2007.

Emerging markets’ share of investment banking revenue will soar to 28%-30% by 2010, according to McKinsey Quarterly. And depending on how quickly the global financial markets recover, emerging markets will see investment banking revenue growth from $40 billion to somewhere between $90 billion and $115 billion in the five-year period of 2005-2010.

McKinsey’s overall thesis - that emerging markets are coming to represent an increasingly important source of investment banking revenues - appears correct. Emerging market economies are generally growing economically much faster than the West, so opportunities for companies are greater and an increasing proportion of the merger business is happening there.

With high Asian savings rates, current account surpluses, and the piling up of petrodollars, emerging markets represent much of the world’s savings pool. So, it’s not surprising that emerging market investment banking business is growing rapidly, both in absolute terms and as a percentage of the global total.

So we should all rush out and buy Goldman Sachs Group Inc. (GS), right?

Not so fast.

First, Goldman Sachs has had huge successes in a number of emerging markets, notably China, but its main business remains with U.S. and European Union companies, and that’s not going to change. Even if its emerging markets business were to expand, it could never be big enough to provide more than a modest uplift over the gloomy prospects for investment banking business domestically.

Second, Goldman Sachs and the rest of Wall Street are hopelessly uncompetitive in terms of costs and fees. They can be undercut, and fairly easily.

Wall Street firms have a habit of relying on superb connections to get the mandates and a dedicated team of top quality salesmen to sell the paper. But with emerging markets being largely separate from the United States and EU, the big Wall Street houses don’t necessarily have the local connections they need.