The threat of international terrorism tends to slow the degree of globalization and also make it become costlier. With terrorism, companies must pay more to insure and provide security for overseas staff and property. Heightened border inspections could slow shipments of cargo, forcing companies to stock more inventory. Tighter immigration policies could reduce the liberal inflows of skilled and blue-collar laborers that permitted companies to expand while keeping wages in check. Moreover, a greater preoccupation with political risk has companies greatly narrowing their horizons when making new investments.