The Inventory/Sales Ratio And 1 Lousy Week For The Stock Market

 | Aug 23, 2015 05:29AM ET

What’s the big picture in economics? That manufacturing makes things to sell at a profit. When that isn’t happening (for whatever reason) there are problems with the economy. During inflationary booms inventories don’t collect dust in the warehouse as demand soon takes delivery for what’s available. So during boom times we see the Inventory to Sales Ratio (ISR) decline in the chart below.

But booms have a way of going bust, and when they do inventories sit on warehouse shelves as sales decline, causing the ISR to rise.

Keep in mind that since 1981 inventory management was revolutionized using the Japanese method of “Just in Time” inventory control, whereby material required for production is timed to arrive at the factory just in time for assembly. Wholesale and retail outlets have also adopted this technique, which is good for business as it doesn’t lock up a company’s cash in unsold inventory; inventory that may become a burden should the economy enter a recession. I suspect the steep decline in the ISR since the 1980s can largely be attributed to just in time inventory management. But some credit for this general decline must also go to the “policy makers” who have been continually inflating bubbles in some area of the economy since 1981, creating artificial demand for goods and services in the process.

Even so, businesses must still warehouse some inventory, and since 1981 changing trends in the ISR have sometimes led and other times followed big changes in the stock market. I don’t advocate using the ISR as a market timing tool to forecast future market trends as it lacks precision. Still, examining inventories and sales over time, via the ISR with the Dow Jones, is worth a look.

The birth of the August 1982- January 2000 stock-market bull was confirmed by a big decline in the ISR (increasing sales/declining inventories) in January 1983. A few months late to be sure, but there it was.

Eight months before the crash of October 1987 the ISR saw a sudden rise as declining sales resulted in rising inventories. A good call for the ISR, and note the stock market (the Dow Jones) continued to stagnate until the ISR once again began declining in 1992.