The S&P 500 gained slightly last week as optimism about a V-shaped economic recovery increased. As written in my recent article, I'm skeptical about the recent market surge as I believe the economy could keep being weak for a longer period of time. However, I believe it could be interesting to cautiously start putting some of your cash at work in this unpredictable market. Insider purchasing activity is very interesting to follow up as this could implicate undervaluation. Much academic literature (as shown in the table below) has proven that insider purchases on average