The MBA mortgage applications index is 11.0 percent higher in the May 2 week. It is 15.0 percent lower than four weeks ago and 26.0 percent higher than a year earlier. The purchase index is 11.1 percent higher in the current week and 5.7 percent lower than four weeks ago and 12.9 percent higher than a year earlier. The refinancing index is 11.1 percent higher and is 25.0 percent lower than four weeks ago and 51.0 percent higher than a year earlier. In the May 2 week, refinancing accounted for 37.1 percent of mortgage applications compared to 37.3 percent in the prior week.

Homebuyers remain sensitive to even small changes in interest rates. The dip in rates in the last few weeks has brought some buyers and refinancers back into the market. However, it is notable that many taking out home loans are opting for adjustable-rate mortgage which can keep initial monthly payments lower.

The fixed-rate mortgage index is 10.0 percent higher in the May 2 week. It is 14.7 percent lower than four weeks ago and 25.2 percent higher than this week last year. The adjustable-rate mortgage index is 23.7 percent higher and is 18.6 percent lower than four weeks ago and 35.5 percent higher than a year ago.

The contract rate for a 30-year fixed-rate mortgage is 6.84 percent in the current week. This is 5 basis points lower than the prior week, 23 basis points higher than four weeks ago, and 34 basis points lower than a year earlier. The contract rate for a 5-year adjustable-rate mortgage is 5.97 percent in the week. This is 8 basis points higher than the prior week, 4 basis points higher than four weeks ago, and 63 basis points lower than a year earlier. In the May 2 week, adjustable-rate mortgages accounted for 8.3 percent of mortgage applications compared to 7.4 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.