Marine insurance once seemed like a specialized financial service, but it quietly shaped global trade by making distant voyages calculable risks rather than all-or-nothing gambles. Premiums, route information, and rules about shared losses helped merchants coordinate shipments across uncertain seas. At the same time, insurance did not eliminate danger; it redistributed and priced risk in ways that influenced which routes and cargoes seemed worthwhile. The passage argues that maritime insurance should be seen as infrastructure for trade, not merely a contract written after trade already exists.