When a typhoon damaged the cinnamon crop in the Central Highlands, cinnamon prices tripled. Linh’s pho spice mix cost more. She worried: if she raised the price, would customers leave? She tested a 5,000 VND increase. Sales dropped only 2%. Demand was inelastic —workers needed quick, hot breakfast. She passed most of the cost to consumers.
The factory created positive externalities (more customers) but also negative externalities (exhaust fumes and litter). Linh started a recycling program: customers who returned a clean bowl got a 2,000 VND discount. This internalized part of the litter externality. The city noticed and offered her a tax deduction for being the first "green pho" shop.
A year later, Linh opened a second shop near the new metro line (a government infrastructure project financed by ADB loans). She hired four workers. Their wages contributed to Vietnam’s GDP via consumption and investment. When a journalist asked how she succeeded, Linh pulled out her dog-eared copy of Economics: Asia-Pacific Edition and said: "My grandmother taught me pho. This book taught me to see the invisible hand."
Linh’s friend, Sam, ran a cà phê sữa đá stand next door. He was fast at making coffee but slow at chopping herbs. Bà Tám was excellent at broth but clumsy with coffee. Linh proposed a trade: each morning, Sam’s helper would chop Linh’s herbs, and Linh’s helper would grind Sam’s coffee beans. By specializing according to comparative advantage (not just doing what they were good at, but what they were relatively better at), both stands increased output without extra labor. Total bowls rose to 95; coffee cups rose to 120.
A new factory opened in the industrial park near Bình Dương, bringing 2,000 workers who commuted past Linh’s street. Demand for breakfast increased —the demand curve shifted right. Linh raised the price from 35,000 VND to 40,000 VND. At the higher price, she could justify the second pot (lower opportunity cost because revenue per bowl was higher). Quantity supplied increased to 110 bowls. Equilibrium moved.
Bà Tám had limited time (4 a.m. to 10 a.m.), limited broth capacity (one large pot), and limited rice noodles. Linh calculated: producing the 81st bowl would require buying a second pot and waking at 2 a.m. The opportunity cost of that bowl was losing sleep and delaying her university homework. For now, 80 bowls was the efficient frontier.
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Send EnquiryWhen a typhoon damaged the cinnamon crop in the Central Highlands, cinnamon prices tripled. Linh’s pho spice mix cost more. She worried: if she raised the price, would customers leave? She tested a 5,000 VND increase. Sales dropped only 2%. Demand was inelastic —workers needed quick, hot breakfast. She passed most of the cost to consumers.
The factory created positive externalities (more customers) but also negative externalities (exhaust fumes and litter). Linh started a recycling program: customers who returned a clean bowl got a 2,000 VND discount. This internalized part of the litter externality. The city noticed and offered her a tax deduction for being the first "green pho" shop.
A year later, Linh opened a second shop near the new metro line (a government infrastructure project financed by ADB loans). She hired four workers. Their wages contributed to Vietnam’s GDP via consumption and investment. When a journalist asked how she succeeded, Linh pulled out her dog-eared copy of Economics: Asia-Pacific Edition and said: "My grandmother taught me pho. This book taught me to see the invisible hand."
Linh’s friend, Sam, ran a cà phê sữa đá stand next door. He was fast at making coffee but slow at chopping herbs. Bà Tám was excellent at broth but clumsy with coffee. Linh proposed a trade: each morning, Sam’s helper would chop Linh’s herbs, and Linh’s helper would grind Sam’s coffee beans. By specializing according to comparative advantage (not just doing what they were good at, but what they were relatively better at), both stands increased output without extra labor. Total bowls rose to 95; coffee cups rose to 120.
A new factory opened in the industrial park near Bình Dương, bringing 2,000 workers who commuted past Linh’s street. Demand for breakfast increased —the demand curve shifted right. Linh raised the price from 35,000 VND to 40,000 VND. At the higher price, she could justify the second pot (lower opportunity cost because revenue per bowl was higher). Quantity supplied increased to 110 bowls. Equilibrium moved.
Bà Tám had limited time (4 a.m. to 10 a.m.), limited broth capacity (one large pot), and limited rice noodles. Linh calculated: producing the 81st bowl would require buying a second pot and waking at 2 a.m. The opportunity cost of that bowl was losing sleep and delaying her university homework. For now, 80 bowls was the efficient frontier.