០៧ មេសា ២០២៥ / April 7, 2025
អត្ថបទនិពន្ធដោយលោក សម រង្ស៊ី ជាភាអង់គ្លេសចេញផ្សាយក្នុងសារព័ត៌មានអន្តរជាតិ The Geopolitics ថ្ងៃទី០៧ ខែមេសា ឆ្នាំ២០២៥។ លោក សម រង្ស៊ី លើកឡើងថា ខណៈដែលសហរដ្ឋអាមេរិកវាយតម្លៃឡើងវិញនូវតួនាទីរបស់ខ្លួនក្នុងពាណិជ្ជកម្មពិភពលោក វាគួររំលឹកពីការងាររបស់សេដ្ឋវិទូម្នាក់ឈ្មោះ David Ricardo ដែលគំនិតរបស់គាត់នៅតែមានមូលដ្ឋាន។
ទ្រឹស្ដីរបស់គាត់ជាងពីរសតវត្សមុន បានផ្តល់ការយល់ដឹងដ៏សាមញ្ញគួរឱ្យកត់សម្គាល់ជាមួយនឹងផលវិបាកយ៉ាងស៊ីជម្រៅ៖ ប្រទេសមួយមិនចាំបាច់ជាអ្នកផលិតដែលមានប្រសិទ្ធភាពបំផុតដើម្បីទទួលបានផលប្រយោជន៍ពីពាណិជ្ជកម្មនោះទេ។
លោក Trump ប្រសិនបើអ្នកនៅតែជឿជាក់លើភាពខ្លាំងនៃសេដ្ឋកិច្ចអាមេរិក ចូរស្តាប់ Ricardo ។ គាត់នឹងបង្ហាញអ្នកថាក្នុងការធ្វើពាណិជ្ជកម្ម សូម្បីតែនៅពេលអ្នកដទៃផលិតបានលឿន និងថោកជាងក៏ដោយ អាមេរិកនៅតែឈ្នះ។
The Geopolitics,
April 7, 2025
DONALD TRUMP SHOULD REMEMBER DAVID RICARDO’S LAW OF COMPARATIVE ADVANTAGE
Even when others produce faster and cheaper, trade still makes America stronger
By Sam Rainsy
As the United States reevaluates its role in global trade, it’s worth recalling the work of an economist whose ideas remain foundational — David Ricardo. Writing over two centuries ago, Ricardo provided a remarkably simple insight with profound consequences: a country does not need to be the most efficient producer to benefit from trade.
Ricardo's theory of comparative advantage, published in 1817, showed that nations gain by specializing in what they do relatively better — not necessarily absolutely better — and trading for the rest. It was a revolutionary concept at the time, overturning the zero-sum assumptions of mercantilism, and it continues to serve as the bedrock of international economics.
Yet today, in an age of resurgent protectionism, this lesson is too often forgotten — especially by leaders like Donald Trump, who regularly frame trade as a contest of winners and losers. His rhetoric treats trade deficits as defeats, and tariffs as weapons to protect American greatness. But by ignoring Ricardo’s insight, the U.S. risks hurting not only its partners but also itself.
A Thought Experiment: America vs. Vietnam
Instead of England and Portugal trading cloth and wine in the 18th century, let us consider a modern Ricardian scenario. Imagine the United States and Vietnam both producing semiconductors and footwear — two contrasting products that represent the high-tech and low-tech ends of the industrial spectrum.
Suppose this is how many labor hours are needed to produce one unit of each:
- USA: 20 hours for semiconductors, 12 hours for footwear.
- Vietnam: 10 hours for semiconductors, 4 hours for footwear.
In this example, Vietnam is more efficient than the U.S. at producing both products. Many would say: “Vietnam should make everything.” But Ricardo would say: look at the opportunity costs.
- In the U.S., making one semiconductor means giving up 1.67 pairs of shoes (20 ÷ 12).
- In Vietnam, making one semiconductor means giving up 2.5 pairs of shoes (10 ÷ 4).
So although the U.S. is slower at making both goods, it sacrifices less footwear to make semiconductors. In economic terms, it has a comparative advantage in semiconductors, while Vietnam has a comparative advantage in footwear.
If both countries specialize accordingly and trade, they will each end up with more of both goods than if they tried to do everything on their own. That’s not theory — that’s logic.
The U.S. Can Still Win Through Trade
Too often, U.S. leaders interpret trade as a zero-sum game. President Trump argued that when the U.S. buys more than it sells, it’s being taken advantage of. But this mindset ignores the fundamental point Ricardo made: trade is not about who is better at everything — it’s about how each country can benefit by focusing on what it gives up the least to do.
Even in a world where the U.S. is outproduced in multiple sectors, trade still makes America stronger, not weaker. It allows U.S. industries to specialize in areas where they have the greatest efficiency relative to their alternatives — often high-value sectors like aerospace, software, and advanced microchips — and to import goods that would cost far more to produce at home.
When the U.S. imposes punitive tariffs, it hurts not only its trade parters but also its own consumers and industries, who face higher costs and reduced competitiveness.
Ricardo’s Legacy Deserves Respect
David Ricardo wasn’t concerned with national pride — he was concerned with economic truth. And the truth is this: even if a country is less efficient in producing everything, it still benefits from trade if it specializes based on comparative advantage.
Ricardo’s insight dismantled the fear of being outcompeted. He showed that trade allows all nations — large and small, rich and poor — to grow through specialization and cooperation. That insight holds even more weight in a complex, globalized economy.
A Final Word to America’s Leaders
Trade is not about domination — it is about coordination. The world does not need a United States that builds walls and raises tariffs. It needs a United States that remembers the ideas it once helped globalize — the very ideas that helped it rise.
Mr. Trump, if you still believe in the strength of the American economy, then listen to Ricardo. He’ll show you that in trade, even when others produce faster and cheaper, America still wins.
Sam Rainsy
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