Differential productiveness over time concentrates market-sourced income in the hands of those who will not recycle it back through the market as payment for consumer goods and services. They already have most of what they want and need, so they invest their excess in new productive power. This is the source of the distributional bottleneck which makes the private property, free market economy ever more dysfunctional. The symptoms of dysfunction are capital concentration and inadequate consumer demand, the effects of which translate into poverty and economic insecurity for the majority of people who depend entirely on wage income and cannot survive more than a week or two without a paycheck. And since, as Adam Smith laid down, economic demand begins with the consumer and consumer purchasing power, the production side of the economy is under-nourished and hobbled.