BBC did a good write up. Jimmy Carter: From peanut farmer to one-term president and Nobel winner https://www.bbc.com/news/articles/c163e0wzgn3o He was the only modern president to return full-time to the house he had lived in before he entered politics, a single-floor, two-bedroom home. According to the Post, the Carters' home was valued at $167,000 - less than the Secret Service vehicles parked outside to protect them.
Jimmy Carter's time in office was marked by high inflation, an oil crisis, and the Iran hostage drama. On the accomplishment side, he managed the negotiate the Camp David accords providing peace between Israel and Egypt, and implemented the Panama Canal turnover. As President, Jimmy Carter's policies for addressing high inflation and the oil crisis were completely ineffective. The American public let him know their dissatisfaction when he was up for re-election; Jimmy Carter went down with one the largest election defeats in recent American history. Jimmy Carter's heart has been in the right place -- promoting peace and stability -- however is economic and other policies as President were fatally flawed. I believe his career since leaving the Presidency is stellar and the mark of a great man.
A golfing friend of my dad was known as the Billionaire, he wasn't a billionaire but probably has passed a hundred million at one stage. Very successful construction business in the US before returning to Ireland with his wife in retirement. He spent his last twenty years of retirement divesting his wealth and I've always admired that he had a modest house (great unspoilt view, I suspect he owned all the land surrounding, I don't blame him) and he wasn't a holy type at all. Very different to Carter but another good influence, admirable and all that.