Demonstrating that terrorism can be good for business, the share prices of the United States’ biggest weapons manufacturers all surged in the wake of the Paris massacres. Lockheed Martin rose over 3% when markets reopened on the Monday after the attacks, and topped 6% this week. In comparison the Nasdaq, the Dow Jones and the S&P500 have all risen around 3.5%. Northrop Grumman has risen 5%, while Raytheon is up nearly 7%. All are up over 30% — Northrop a massive 50% — since the US launched its air operations against Islamic State in 2014, compared to a 17% rise in the Nasdaq. Not that French companies have missed out — Gallic arms giant Thales has also risen 6% since the Paris attacks.