Connecting all concept dimensions with AND shrinks extension toward zero

Evidence

One way to build into the concept that its extension is likely to be zero is to use the necessary and sufficient condition structure for the concept. Dahl quite clearly uses AND at both levels of his concept of democracy. Everything at all levels is connected via AND (i.e., it is 100 percent nonhybrid). This makes it very difficult to find any real-world phenomenon that satisfies such exigent conditions. — Gary Goertz, Social Science Concepts and Measurement, 1399