For an economy with an ageing population, for example, current account surpluses and the associated accumulation of net foreign wealth might well be a reasonable and efficient market outcome as its consumption rate is expected to grow in the future.
As long as the global distribution of production and consumption reflects undistorted saving and investment decisions that put capital to the most productive use, it contributes to global growth and prosperity. In the same vein, financial innovation generally has positive effects, as it provides access to high-yield investment projects and thereby allows better risk sharing and lifecycle consumption smoothing.