Roughly one in three people in the United States have less than $5,000 in retirement savings, but for those lucky enough to have some money stashed away, the cost of investing has been getting lower and lower. Management fees for mutual funds have dropped to fractions of a percent over the last decade, and some funds have no fees. So what's driving the fee wars? What do institutions get out of it? We'll talk about it. Then, a conversation with Ahmir Khalib Thompson, better known as Questlove of the legendary Roots crew, about deciding to accept his biggest job offer. Plus, what you need to know about this week's market turbulence.