The UNCTAD however wasn't very effective in implementing this New International Economic Order (NIEO), and social and economic inequalities between industrialized countries and the Third World kept on growing throughout the 1960s until the 21st century. The 1973 oil crisis which followed the Yom Kippur War (October 1973) was triggered by the OPEC which decided an embargo against the US and Western countries, causing a fourfold increase in the price of oil, which lasted five months, starting on October 17, 1973, and ending on March 18, 1974. OPEC nations then agreed, on January 7, 1975, to raise crude oil prices by 10%. At that time, OPEC nations – including many who had recently nationalized their oil industries – joined the call for a New International Economic Order to be initiated by coalitions of primary producers. Concluding the First OPEC Summit in Algiers they called for stable and just commodity prices, an international food and agriculture program, technology transfer from North to South, and the democratization of the economic system. But industrialized countries quickly began to look for substitutes to OPEC petroleum, with the oil companies investing the majority of their research capital in the US and European countries or others, politically sure countries. The OPEC lost more and more influence on the world prices of oil.