Corporate management often pays attention to activist investors. : This week’s digest looks at the big impact little shareholders can make on a company, reports on a Papal warning about imbalances in the global economy, and highlights stocks that hedge-fund professionals are buying for their portfolios. Plus, hear what respected tech investor Masayoshi Son has to say about finding tech investments with payoff potential. It’s more than just voting a proxy — activist investors have made an impact in plenty of cases.