Sometimes I encounter the word indeterminacy when macro books are discussing sunspot shocks, expectational errors, etc. (but stability and eigenvalues are not mentioned). Here, indeterminate equilibrium appears to be when you have sunspot shocks in the model.
Other times, I encounter indeterminacy when macro books are discussing stability, eigenvalues, BK condition, etc (But no mention of sunspot shocks, expectational errors). Here, indeterminate equilibrium appears to be when you have fewer unstable eigenvalues than jump variables in the model (i.e., the model is too stable leading to multiple equilibria)
And sometimes indeterminacy is mentioned when some equation does not converge.
Are these all kinda connected in one definition of indeterminacy? Thus,
- sunspot shocks and expectational errors
- stability and multiple equilibria.