By 1990, Moscow had found it increasingly difficult to meet its economic responsibilities to Havana. In 1985, it had paid over eleven times the world price for Cuban sugar, but in 1989, it paid only three times the world price. As the economy continued to decline, members of the Soviet elite grew more critical of the unequal terms of trade. For many, "it seemed contrary to the nature of "perestroika" to continue to prop up an inefficient Cuban economy while struggling to reform the Soviet economy." That forced the Cuban government to search elsewhere for foreign investment and trade. In what was called a "zero-option approach," the Cuban government in 1990 and 1991 established tariff-free trading agreements to boost imports and exports, gave foreign entities more autonomy and generous tax incentives, and began to diversify the economy by focusing more on the pharmaceutical industry and tourism.