Chapter One
The Number on Election Night
Imagine a host making a simple promise on a restless election evening. After every completed U.S. midterm since 1950, a broad stock index delivered a positive reported return over the next year. The host has a slide with nineteen rising marks and not one falling mark. There is no small type that the audience can read from their seats. The claim is brief enough to remember on the way home and strong enough to tempt someone to act before morning.
The remarkable part is that the central observation is true under a familiar definition. J.P. Morgan Asset Management reports that the S&P 500 rose in the twelve months following each midterm from 1950 through 2022, with an average gain of about fifteen percent. Count those elections at four year intervals and there are nineteen. A positive endpoint occurred in each case. We should not dismiss a record simply because it is convenient for a sales pitch. We should understand what was counted.
The words carry four quiet conditions. They refer to one U.S. stock index, rather than every share market. They use a twelve month window after each election, rather than the few days that follow the vote. They begin at 1950, rather than at the first congressional midterm in U.S. history. They end with the last completed midterm for which a full following year is available. In October 2026, the next vote was still ahead. Add or change one of those conditions and the headline may change.
