Homelessness and world hunger are not bottlenecked by money. There's a stronger case for healthcare, but that's also substantially a political issue.
Certainly the most skilled and advanced in the medical field will need significant schooling but there needs to be a major reform in healthcare training. One that produces more knowledgeable and skilled professionals and not a glut of questionably competent nurse practitioners.
What’s the joke? “What do you call the person who graduated last in their class from med school? A doctor.”