File(s): File format is application/pdf https://files.stlouisfed.org/files/htdocs/publications/review/71/07/Principles_Jul1971.pdf

File(s): https://fraser.stlouisfed.org/scribd/?toc_id=499276&filepath=/docs/publications/frbslreview/rev_stls_197107.pdf&start_page=16#scribd-open