Counterfeited and pirated goods accounted for up to 2.5 per cent of world trade, or as much as $US461 billion ($A603 billion), significantly damaging companies and state coffers, the Organisation for Economic Co-operation and Development (OECD) says.

The trade in fake products such as Louis Vuitton bags or Nike shoes has also worsened in the past decade, with a previous OECD study in 2008 estimating it at up to 1.9 per cent of world imports or $US200 billion.

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