WASHINGTON--The possibility of property expropriation is increasing in oil and other commodity exporting nations as prices have risen, according to Aon brokerage, which released its map of global political risk yesterday.

Bryan Squibb, managing director of Aon Trade Credit Global, warned at a press conference: "Risk is one of the fundamental drivers of the global economy and misunderstanding it can be fatal to a business."

Mr. Squibb said he has "noted a significant increase in the number of CEOs, CFOs and chief risk officers who are seeking a greater understanding of how their businesses are at risk in an increasingly complex global environment versus their primary risk concerns ten years ago."