Theories of economic development suggest variously that national income increases or decreases the propensity for states to fight, while systematic evidence of the impact of development on warfare is ambiguous or non-existent. The lack of empirical support for nominally opposing claims can be...

Scholars have suggested several ways in which economic development could affect interstate conflict. Supply side arguments view modern economies as more difficult to subdue or exploit through force (i.e., development creates states that are 'bitter pills'). The demand side perspective argues in...