Final answer:
W.I. Thomas argued that if people define a situation as real, it is real in its consequences.
Step-by-step explanation:
W.I. Thomas argued that if people define a situation as real, it is real in its consequences. This concept is known as the Thomas theorem. According to this theorem, people's behavior can be influenced by their subjective construction of reality rather than by objective reality. For example, if an individual believes they are being judged or labeled, they may internalize that belief and act accordingly. So, if someone defines a situation as real, it can have real consequences.