The idea that what is true for one member of a group must inevitably also be true for the group as a whole is known as the fallacy of composition. Despite the fact that the aforementioned fallacy is widely known, it is frequently disregarded in ordinary discussions on economic matters. Here's an example of this failure. Wheat farming is a significant activity on the Canadian Prairies. Assume that a Saskatchewan farmer plants more wheat than usual. He reaps a bountiful harvest because the prairie weather is ideal for growing. The farmer is a minor producer, thus his increase in supply has a little effect on the wheat market price. With more wheat produced at the same price, the farmer's income increases. However, if all farmers expand their wheat planting and the climate is favourable in wheat- growing locations around the world, the significant increase in supply will cause the price of wheat to fall so drastically that all farmers will earn less income than they did previously. This is an example of the fallacy of composition, which holds that what is true for one (micro) does not always hold for all (macro). "The whole is larger than the sum of the parts" is another expression that describes fallacy of composition. Sources: http://www.pearsoned.ca/highered/showcase/cohenmacro/pdf/ch01.pdf https://geoforcxc.com/economic-activities/wheat-farming-in-canada/ https://blogs.stthom.edu/cameron/fallacy-of-composition-in-economics/ http://www.pearsoned.ca/highered/showcase/cohenmacro/pdf/ch01.pdf