The reliance on natural resources has several effects on the Canadian economy and Canadian society. While manufacturing and service industries are easy to standardize, natural resources vary greatly by region. This ensures that differing economic structures developed in each region of Canada, contributing to Canada's strong regionalism. At the same time the vast majority of these resources are exported, integrating Canada closely into the international economy. Howlett and Ramesh argue that the inherent instability of such industries also contributes to greater government intervention in the economy, to reduce the social impact of market changes.