A major blow to the Bolivian economy came with a drastic fall in the price of tin during the early 1980s, which impacted one of Bolivia's main sources of income and one of its major mining industries. Since 1985, the government of Bolivia has implemented a far-reaching program of macroeconomic stabilization and structural reform aimed at maintaining price stability, creating conditions for sustained growth, and alleviating scarcity. A major reform of the customs service has significantly improved transparency in this area. Parallel legislative reforms have locked into place market-liberal policies, especially in the hydrocarbon and telecommunication sectors, that have encouraged private investment. Foreign investors are accorded national treatment.