; and (iii) facilitate enforcement of penalties against persons in violation of relevant statutory prohibitions. (B) Specific duties In order to carry out the responsibility under subparagraph (A), the Unit shall assist the Secretary in carrying out the following duties: (i) Receiving, compiling, and analyzing relevant buying and selling activity in order to identify and investigate anomalous market trends and suspicious behavior. (ii) Determining whether excessive concentration or exclusive control of housing-related infrastructure may allow or result in anti-competitive behaviors. (iii) Obtaining a data-sharing agreement with State and local jurisdictions, housing agencies, and relevant public and private data sources to receive and archive information on housing purchases by institutional investors within a given area. 5. Investigations of excessive housing purchases The Secretary shall monitor purchases of single-family housing in each housing market area in the United States, as determined by the Secretary, to determine whether any single purchaser of such housing, including any purchaser that is an institutional investor, is purchasing an excessive amount of such housing made available for sale in any such market area. If the Secretary determines that any single purchaser has purchased more than 5 percent of the single-family housing made available for sale in any market area over a 3-year period, or if, in aggregate, large institutional investors have purchased more than 25 percent of the single-family housing made available for sale in any market area over a 1-year period, the Secretary shall conduct an investigation to determine the purposes of and circumstances involved in such purchases, including price gouging, market manipulation, and unfair investment practices that drive homeowners out of the market. 6. Identification of unfair screening practices The Secretary, the Federal Trade Commission, and the Bureau of Consumer Financial Protection shall jointly— (1) carry out a program to collect