However, this does not mean that the living standards of unskilled workers in developed nations have declined. It is possible that economic growth in developed nations has offset the fall in unskilled workers' share of national income, raising their living standards. In fact, evidence suggests that real labor compensation has expanded robustly in most developed nations since the 1980s, including the United States. A study by the organization for Economic Cooperation and Development, whose members include the 20 richest economies in the world, noted that while the gap between the poorest and richest segments of society in some OECD countries had widened, this trend was by no means universal.