Flow of funds are financial accounts that are provided by Federal Reserve quarterly. The package contains all datasets < https://www.federalreserve.gov/datadownload/Choose.aspx?rel=z1>, tables < https://www.federalreserve.gov/apps/fof/FOFTables.aspx> and descriptions < https://www.federalreserve.gov/apps/fof/Guide/z1_tables_description.pdf> with functions to understand series < https://www.federalreserve.gov/apps/fof/SeriesStructure.aspx> and explore them.