After the war, South Korean policymakers set upon stimulating economic growth by promoting indigenous industrial firms, following the example of many other post-World War II developing countries. The government selected firms in targeted industries and gave them privileges to buy foreign currencies and to borrow funds from banks at preferential rates. It also erected tariff barriers and imposed a prohibition on manufacturing imports, hoping that the protection would give domestic firms a chance to improve productivity through learning-by-doing and importing advanced technologies. Under the policy, known as import-substitution industrialization (ISI), entrepreneurs seemed more interested in maximizing and perpetuating favors by bribing bureaucrats and politicians, however. This behavior, dubbed as directly unproductive profit-seeking activities (DUP), caused efficiency to falter and living standards to stagnate, providing a background to the collapse of the First Republic in April 1960.
The military coup led by General Park Chung Hee overthrew the short-lived Second Republic in May 1961, making a shift to a strategy of stimulating growth through export promotion (EP hereafter), although ISI was not altogether abandoned. Under EP, policymakers gave various types of favors — low interest loans being the most important — to exporting firms according to their export performance. As the qualification for the special treatment was quantifiable and objective, the room for DUP became significantly smaller. Another advantage of EP over ISI was that it accelerated productivity advances by placing firms under the discipline of export markets and by widening the contact with the developed world: efficiency growth was significantly faster in export industries than in the rest of the economy. In the decade following the shift to EP, per capita output doubled, and South Korea became an industrialized country: from 1960/62 to 1973/75 the share of agriculture in GDP fell from 45 percent to 25 percent, while the share of manufacturing rose from 9 percent to 27 percent. One important factor contributing to the achievement was that the authoritarian government could enjoy relative independence from and avoid capture by special interests.