Caterpillar Inc. operates in more than 180 countries worldwide and generates over half its annual sales outside the United States. It follows a global strategy by having centralized design control to ensure interchangeable parts that fit equipment globally. This allows Caterpillar to achieve economies of scale and exploit worldwide sales volume and the existing market for parts revenue. While a global strategy has benefits, the best approach is usually a combination of global integration and domestic adaptation to address shortcomings of either strategy alone.