The third and fourth of the five-year plans occurred from 1973 to 1981. During this period, the country's labor force was in high demand. Competition from other countries began eroding South Korea's competitive edge. The government responded to this change by concentrating its efforts on mechanical and electrical engineering, shipbuilding, petrochemicals, construction, and military initiatives. At the end of this period, the government forced Daewoo into shipbuilding. Kim was reluctant to enter this industry, but Daewoo soon earned a reputation for producing competitively priced ships and oil rigs.