The global coffee production ranking is one of the most lopsided in agriculture. Brazil produces around 65 million 60-kilogram bags. Vietnam, second, produces about 27 million. Colombia, third, produces 13.5 million. Brazil alone accounts for roughly as much as the next three countries together.
Concentration turns local weather into a global price signal
In most commodities, a poor harvest in one country is absorbed by output elsewhere. Coffee does not work that way, because so much of the supply sits in one place — and much of that in a handful of Brazilian states, with Minas Gerais the largest.
Coffee trees are perennial and frost-sensitive. A single cold night during a Brazilian winter can damage trees badly enough to reduce yields not only in the coming harvest but for two or three years while they recover. Traders know this, which is why futures prices can move sharply on a Brazilian weather forecast before anyone has confirmed actual damage.
The 1975 Black Frost remains the reference case: it destroyed a large share of Brazil's trees and pushed world prices to levels that persisted for years. Nothing since has matched it, but the market's sensitivity to Brazilian frost reports dates from it.
The variety split matters as much as the volume
The ranking alone conceals something important. Brazil and Colombia grow mostly arabica — the milder, more aromatic species that dominates filter coffee and speciality roasting. Vietnam's crop is overwhelmingly robusta, which is harsher, higher in caffeine, and cheaper to grow because the plant tolerates heat, humidity and disease far better.
Robusta goes predominantly into instant coffee and into espresso blends, where it contributes body and crema. So a shortfall in Colombia and a shortfall in Vietnam do not affect the same buyers. Speciality roasters and instant coffee manufacturers are, to a significant degree, operating in separate markets that happen to share a name.
Vietnam's rise was extraordinarily fast
Vietnam barely registered as a coffee producer in the 1980s. Government policy after economic liberalisation pushed hard into robusta in the Central Highlands, and within about fifteen years the country had gone from negligible to second in the world.
The effect on prices was severe. The surge in supply contributed to the coffee price crisis around the turn of the millennium, when prices fell below production cost for many growers and smallholders across Central America and East Africa abandoned their farms.
Where the coffee is grown and where it is consumed barely overlap
Every country in the production top eight lies in the tropics, because arabica and robusta both need specific bands of altitude, rainfall and temperature. None of the largest consuming countries per head — the Nordic nations, the Netherlands, Switzerland — grows any at all.
This is why coffee has such a long and politically charged trade history, and why the value chain is so uneven: the growing is concentrated in lower-income tropical countries while roasting, branding and retail, where most of the margin sits, happen elsewhere. Ethiopia, fifth in production and the plant's place of origin, captures a small fraction of the final retail value of its own crop.