A 2009 study of California HOAs suggested that this assumption was partially true, but that the overall effect of HOAs on municipalities was mixed. While HOAs did offset the costs of city governments to a small degree, they also reduced overall tax revenues because their members, insulated from the larger community, tended to vote down taxes that the city required to fund services. This led to an overall decrease in government expenditures that disproportionately affected those citizens who did not reside in an HOA.