Yearly data put the rest of the noise into perspective. Most of the weekly or monthly random up-and-down movements get smoothed out. Ultimately, this is where long-term investors should be focused.

Little white lies are told by humans all the time. Indeed, lying is often how we get through each day in a happy little bubble. We spend time and energy rationalizing our own behaviors, beliefs and decision-making processes.

Investing is about making probabilistic decisions with limited information about an unknowable future. The variables are well known, as are the possible outcomes.

The electronics industry expanded rapidly and the seeds for the semiconductor and software revolution were planted. The postwar period also saw the suburbanization of America, the rise of the homeowner, the build-out of the interstate highway system, and the rise of automobile culture. Credit availability expanded dramatically.

Indeed, eventually, random outcomes all revert to the mean, meaning that streaks eventually end. Understanding this is a key part of intelligent and rational investing.