The MBA mortgage applications index is 1.4 percent higher in the September 6 week. It is 7.0 percent lower than four weeks ago and 28.3 percent higher than a year earlier. The purchase index is 1.8 percent higher in the current week and 0.7 percent higher than four weeks ago and 3.5 percent lower than a year earlier. The refinancing index is 0.9 percent higher and is 14.8 percent lower than four weeks ago and 106.5 percent higher than a year earlier. In the September 6 week, refinancing accounted for 46.7 percent of mortgage applications compared to 46.4 percent in the prior week.

The fixed-rate mortgage index is 1.5 percent higher in the September 6 week. It is 5.0 percent lower than four weeks ago and 31.1 percent higher than this week last year. The adjustable-rate mortgage index is 0.8 percent lower and is 31.6 percent lower than four weeks ago and 7.0 percent lower than a year ago.

MBA Deputy Chief Economist Joe Kan said,"Purchase applications increased over the week and are edging closer to last year's levels. Despite the drop in rates, affordability challenges and other factors such as limited inventory might still be hindering purchase decisions." He said,"With rates almost a full percentage point lower than a year ago, refinance applications continue to run much higher than last year's pace. However, there is still somewhat limited refinance potential as many borrowers still have sub-5 percent rates. It is a positive development that there are homeowners who can benefit from a refinance as rates continue to move lower."

The contract rate for a 30-year fixed-rate mortgage is 6.29 percent in the current week. This is 14 basis points lower than the prior week, 25 basis points lower than four weeks ago, and 98 basis points lower than a year earlier. It is down for the sixth week in a row.

The contract rate for a 5-year adjustable-rate mortgage is 5.85 percent in the week. This is 13 basis points lower than the prior week, 19 basis points lower than four weeks ago, and 74 basis points lower than a year earlier. In the September 6 week, adjustable-rate mortgages accounted for 5.4 percent of mortgage applications compared to 5.5 percent in the prior week.

The Mortgage Bankers' Association compiles various mortgage loan indexes. The purchase applications index measures applications at mortgage lenders. This is a leading indicator for single-family home sales and housing construction.

This provides a gauge of not only the demand for housing, but economic momentum. People have to be feeling pretty comfortable and confident in their own financial position to buy a house. Furthermore, this narrow piece of data has a powerful multiplier effect through the economy, and therefore across the markets and your investments. By tracking economic data such as the Mortgage Bankers Association purchase applications, investors can gain specific investment ideas as well as broad guidance for managing a portfolio.

Each time the construction of a new home begins, it translates to more construction jobs, and income which will be pumped back into the economy. Once a home is sold, it generates revenues for the home builder and the realtor. It brings a myriad of consumption opportunities for the buyer. Refrigerators, washers, dryers and furniture are just a few items new home buyers might purchase. The economic"ripple effect" can be substantial especially when you think a hundred thousand new households around the country are doing this every month.

Since the economic backdrop is the most pervasive influence on financial markets, housing construction has a direct bearing on stocks, bonds and commodities. In a more specific sense, trends in the MBA purchase applications index carry valuable clues for the stocks of home builders, mortgage lenders and home furnishings companies.