The new paid search systems direct traffic to other in-stock products when supplies run low.

FORBES: Improved Paid Search Ads Spurring Growth In E-Commerce

In general, retailers have learned to focus far more on lowering prices, and in particular to stock a larger proportion of products at the low end of the price range.

ECONOMIST: America's shoppers

The innovation allowed me to invest in low-cost index funds because these products sold like stocks on a stock exchange.

FORBES: How I View ETFs

While stock markets can be volatile, stakeholder pensions are designed to be low risk products.

BBC: Should you grab a stake?