The deal Congress refuses to ratify would remove or sharply reduce tariffs on most U.S. exports to Colombia.
Barroso added that tariffs must be cut wherever it makes sense and is possible.
One traditional fix is tariffs and subsidies, which can offset an uncompetitive exchange rate.
The tariffs allow even more inefficient firms to gather a profit in the protected industry.
Another problem with this argument for tariffs is that it overlooks another free market solution.
Some people suggest that protecting an infant industry with tariffs is a special exception.
In May the US imposed tariffs of about 31% on solar panel imports from China.
The steel tariffs hurt most Americans as the growing complaints from America's industrial consumers of steel attest.
The foreign suppliers choose to move here to dodge tariffs, currency swings and transportation costs.
And it complains about high American tariffs on its exports of sugar, textiles, tobacco and ethanol.
There is suspicion that Argentina is also being used to avoid Brazilian antidumping tariffs.
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Last month, the US said it would increase tariffs on solar cells imported from China.
In May, the US imposed similar tariffs of about 31% on solar panel imports from China.
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Marc Tielemans says it's not always easy for businesses to cut through the complex tariffs.
This means entering trade deals and cutting tariffs so we are not at a competitive disadvantage.
In the latter case tariffs become an additional difference between the two prices when in parity.
America's oil pipelines are largely unfettered by the rigid regulations that govern gas-pipeline tariffs.
Thirdly, a relaxation of restrictions on foreign ownership and competition, ranging from tariffs to ownership regulations.
Yet some still cling to protectionist tariffs like an overgrown child to a security blanket.
Gladstone announced treaties that further reduced tariffs affecting trade with Austria, Belgium and the German states.
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Europe is retaliating by introducing tariffs on American exports like citrus fruits and linen products.
Meanwhile, our global competitors are entering agreements with each other and cutting and eliminating tariffs.
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We introduce tariffs or pay farmers not to farm, thus raising prices for everyone else.
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Is based upon export tariffs when one nation is the overwhelming supplier to the world market.
But the cuts in industrial tariffs were not matched by market access for Australia's farmers.
Tariffs and anti-dumping actions can also prevent developing-country companies from getting into the rich world.
And on Tuesday, Brazilian Finance Minister announced new import tariffs for around 100 products.
It kept energy tariffs frozen at their 2002 level, deterring investment and prompting blackouts last year.
Although they do lower some barriers, most do nothing to tackle the highest tariffs.
The new restrictions range from higher tariffs to costly import licences and customs controls.
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