While snapshot information might prove invaluable in the short run, corporate managers usually benefit a lot more from trend studies. Unlike panel studies, trend studies sample different groups of people from the same target population at fixed time intervals, providing information on net change, at an aggregate level, over time. Trend studies also help corporate managers attain a better understanding of market dynamics, allowing them to unearth correlations between different market factors. Trendline data, moreover, are crucial for internal performance assessments as they provide ample information on how a company and its programs are translating into greater market shares and increased profit margins over time.