I didn't downvote you, but it would be reasonable to downvote you simply because your original sentence doesn't express a full idea. You could have added anothe

I didn't downvote you, but it would be reasonable to downvote you simply because your original sentence doesn't express a full idea. You could have added another sentence or two to explain what the advantage of the stock market is. However, your follow up also seems inaccurate: "interest rates on T-bills" The article covers a period of 700 years, so clearly more than T-bills are under discussion.