For the last several decades, the Republican party has been selling a simple economic message to its base: what is good for rich people is good for you too.  And, until this election, the base was buying it.  The astonishing rise of Donald Trump is an almost apocalyptic sign that they’re not buying it any more.

The GOP establishment has seen all of its candidates not merely beaten, but utterly humiliated, by an aggressively ignorant demagogue, whose rhetoric makes him sound like a cheap knockoff of Benito Mussolini and George Wallace.

Why? A look at the facts of American economic life suggests that the rubes have decided they’re tired of being played for marks, which explains why the GOP establishment’s siren song about the Land of Opportunity is no longer doing the trick.

The basic myth the right wing of The Money Party has sold to Republican voters over the past 40 years (the left wing of the party is called the Democrats) goes like this: the economy boomed in the decades immediately after World War II, and standards of living rose rapidly.  But since then, too much government regulation, too many taxes, and an overly generous welfare system that has made Those People even lazier than they were before have combined to kill the American dream.

That is why ordinary Americans (aka working and middle-class white people) have bank accounts that don’t reflect the rewards they should have received for all their hard work. If not for government meddling we would have a thriving economy, just like the one we enjoyed back in the good old days.

All this is a fantastic lie, as a glance at the actual economic history of America since 1945 illustrates.  (In what follows, all figures have been converted to constant, inflation-adjusted dollars).

America is a vastly wealthier country today than it was forty years ago.  Furthermore, on a per-person basis, the country’s wealth has increased far more over the past four decades than it did in the thirty years immediately after World War II.

Here are the numbers: between 1945 and 1974, per capita GDP in the U.S. grew from $17,490 to $27,837.  That is an impressive improvement, but it pales in comparison to what has happened since: in 2014, per capita GDP was $55,185, i.e., almost exactly double what it was in 1974.  In terms of economic output, the country is twice as rich per person now as it was then.

Where has all this money gone?  The answer ought to shock anyone who cares about either economic opportunity or increasing inequality.  The average household income of the bottom 50% of American households was $25,475 in 1974, and $26,520  in 2014.  In other words, half the population has gotten essentially none of the extra $10 trillion dollars of national wealth that the American economy has generated over the past forty years.  

Keep in mind that this group includes fully half of the nation’s middle class, by every standard definition of that category.