Realtor® comments in the latest Realtors® Confidence Index survey,  indicate that an increasing number of home buyers have been making all-cash purchases in recent years.  The high preponderance of all-cash sales appears to be due to a number of factors:  Unrealistically high loan underwriting standards, a significant level of investor participation in the market, and sales of properties as second homes.  Cash sales made up 31 percent of residential sales in March.