Due to these concerns, lorazepam use is generally only recommended for up to two to four weeks. Lorazepam was initially patented in 1963 and went on sale in the United States in 1977. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.
David Ricardo, the British economist who invented the theory of comparative advantage in 1817, actually knew about this problem perfectly well, and wrote about it in his book on the subject. So there's no excuse for modern economists to ignore it. Dubious Assumption #6: Short-term efficiency causes long-term growth.
The simple framework that Porter developed for achieving a competitive advantage in the marketplace is still being taught in business schools today. Porter's techniques for analyzing competitors In his 1980 book, Competitive Strategy: Techniques for Analyzing Industries and Competitors, Porter maintains that the attractiveness of a market segment is determined by five competitive forces: