It sounds like Jim Palmer needed a second job because he made a decision to live beyond more-than-adequate means. He was at, with his regular salary alone, about $1000 beyond twice the federal poverty line for 1966 for a non-farming family of four. In 1947 the minimum MLB salary was 5000? I'm seeing the Sub Committee on Low Income Families in 1948 defining low income as $2000 for non-farming families.First time I have EVER heard of Yogi Berra, Stan Musical, Willie Mays or Jim Palmer as a semi-pro.
But hey whatever floats your boat.
https://medium.com/buzzer-beater/when-ballplayers-had-offseason-jobs-66bba31cecb2
So, you're right... I said players in the 1940s were likely not quite competing in a fully professional league - I was wrong, with regard to Major League Baseball. Clearly the Major Leagues were fully professional by the mid-1940s.