Goldman Sachs is making a comeback. The investment bank posted its best equities trading results in three years today (April 17). The Wall Street firm’s quarterly profit rose 26% (paywall) relative to the same time last year, leaving the bank $2.8 billion richer. The looming US-China trade war and Facebook’s data scandals have roiled the markets. All the volatility was good news for Goldman, which reported a 38% rise in stock-trading revenue. But Goldman’s trading success comes at a time when...