Jim Cooke, a Coolidge impersonator and presidential expert, wrote in to note that my previous Echoes post had Coolidge slightly wrong.

Coolidge said: "The chief business of the American people is business" and not, as the column said, "The chief business of America is business."

Jim also takes issue with my description of the cheese factory that the president's father ran in Plymouth Notch. Jim says it was more of a cooperative venture than a business for his profit alone. That makes sense. The village of Plymouth Notch created the factory as a way to sell their milk.

(Amity Shlaes, a senior fellow in economic history at the Council on Foreign Relations and a Bloomberg View columnist, oversees the Echoes blog. The opinions expressed are her own.)

To contact the author of this blog post: Amity Shlaes at amityshlaes@hotmail.com.

To contact the editor responsible for this post: Timothy Lavin at tlavin1@bloomberg.net.