Because of the so-called
Spanish miracle, which has been attributed to him and the other Spanish technocrats, Ullastres has been counted among the "great economists". He studied the economic doctrines of the
School of Salamanca of the 16th and 17th centuries, especially the doctrine of
Juan de Mariana and of
Martín de Azpilcueta. In an article "The Awakening Land",
Time magazine attributed Spain's economic modernization to him: "On a hot July day in 1959, Ullastres announced a sweeping stabilization plan. Credit was tightened, the budget slashed, the peseta devalued to a realistic 60 to the dollar. With the aid of a $400 million international loan, Ullastres threw open Spain's doors to imports necessary to rebuild its economy. And over the howls of government protectionists, he pushed through a series of measures to encourage foreign investors to enter Spain. The success of the stabilization plan was miraculous. By 1963 Spain had $1.1 billion in foreign reserves and a booming economy." == Minister of Trade ==