StockCharts.com maintains long-term historical charts of various major stock market indices, interest rates, currencies, commodities, and economic indicators.
As a long-term reference, below are charts depicting various stock market indices for the dates shown. All charts are depicted on a monthly basis using a LOG scale.
(click on charts to enlarge images)(charts courtesy of StockCharts.com)
The DJIA, from 1900-May 1, 2015:
The Dow Jones Transportation Average, from 1900-May 1, 2015:
The S&P500, from 1925-May 1, 2015:
The Nasdaq Composite, from 1978-May 1, 2015:
The Special Note summarizes my overall thoughts about our economic situation
SPX at 2116.90 as this post is written