They found that most available literature focuses on OECD and middle-income countries somewhat, where economic growth impact has been shown to be positive on employment. The researchers didn't find sufficient evidence to conclude any impact of growth on employment in LDCs despite some pointing to the positive impact, others point to limitations. They recommended that complementary policies are necessary to ensure economic growth's positive impact on LDC employment. With trade, industry and investment, they only found limited evidence of positive impact on employment from industrial and investment policies and for others, while large bodies of evidence does exist, the exact impact remains contested.