When Donald Trump announced the US would impose a blanket tariff of 10 per cent on Australian imports earlier this year, a commotion ensued.

The president's so-called "liberation day" sent a wave of grievance through the farm sector, having not-long emerged from years of punitive trade disruptions imposed by China.

The prospect of an importing nation charging an additional tax threatened a major hit to the hip pockets of those trading into the world's largest economy (by GDP) and, in turn, its markets.

But what is less well known is that Australian farmers and exporters of agricultural produce are already losing out on an estimated $4 billion of annual export trade each year.

$4bn wiped off exports

It's not through tariffs, but rather what's known as non-tariff trading barriers.

"So

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