Opposition to the resumption of specie convertibility of the Greenbacks during 1879 was accordingly muted. Greenbacks were therefore perfect substitutes for gold coins. Hence continued inflationary measures such as further issuance of greenbacks artificially supported domestic industries. Richardson complied using greenbacks to expand the money supply. Unbacked "paper" (wanted by the Greenbacks) represented a third option. It involved retaining gold reserves totaling forty percent of circulating greenbacks through bond sales. Third, the government printed paper money called "greenbacks". Real-world money can be used to purchase a greater number of greenbacks. Prizes typically include items for raising character attributes, greenbacks, T-coins, DNA cards and pizza points. By the end of the war, $450 million worth of greenbacks were in circulation. Greenbacks from thereon became freely convertible into gold. It was generally believed that the U.S. Government would eventually redeem the "greenbacks" with gold. The largest amount of greenbacks outstanding at any one time was calculated as $447,300,203.10. Booth paid Mudd $25 in greenbacks for his services. Stevenson backed off his former support of greenbacks in favor of Cleveland's gold standard policy.