Erlich was a moron in 1968 and has been losing ground since. Recall his famous wager with the late economist Julian Simon,
every single part of which Erlich lost, and you can see by his own actions that he hasn't the first clue about markets, scarcity, human behavior, or any part of macroeconomic theory whatever.
In fairmess, he did (finally, years later) pay off the wager. Look for his picture in the dictionary next to the definition of 'loser'.