From the Summary: "Members of the House of Representatives have one consolidated allowance, the Members' Representational Allowance (MRA), with which to operate their offices. The MRA was first authorized in 1996 and was made subject to regulations and adjustments of the Committee on House Administration. Representatives have a high degree of flexibility to use the MRA to operate their offices in a way that supports their congressional duties and responsibilities, and individual office spending may be as varied as the districts Members represent. [...] This report provides a history and overview of the MRA and examines spending patterns in recent years."
CRS Report for Congress, R40962
Congressional Research Service: https://crsreports.congress.gov/