Homeowners and professional contractors visit companies in the Retail Building Supply Industry to purchase the materials and tools necessary to build houses, complete remodeling projects, and perform household chores and maintenance. Overall, the industry is mature, and its sales growth tends to move roughly in line with the trends of the broader economy. This group is highly competitive, and is dominated by a couple of big multinational warehouse chains. The remainder of the industry is comprised mostly of small, specialty retailers, serving niche markets. The few publicly traded companies compete against a large number of private hardware stores and lumber yards.