circular referencing

• Circulatory references are often thought of as if they are bad
• It's good if it's beneficial even if it's a circular reference.
• At first glance, it may sound like a radical thought, "It's okay to make circular references."
  • However, in Dynamic systems, there is nothing strange about a value X being represented as $X_{t+1}=f(X_t)$.
  • It's not even strictly a circular reference because the time is off.
• It is excessive abstraction that humans equate $X_{t+1}$ and $X_t$ by calling both "X"!

relevance - tautology

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