Most useful economic or financial markets data is some kind of time series. For example, what was the maximum price of a stock in the last year, and how does i

Most useful economic or financial markets data is some kind of time series. For example, what was the maximum price of a stock in the last year, and how does it compare to the current price? FRED (https://fred.stlouisfed.org/ https://fred.stlouisfed.org/) is a great resource for publicly available economic time series data.