  Rational pure bubble models feature multiple (and often a continuum of)
equilibria, which makes model predictions and policy analyses non-robust. We
show that when the interest rate in the fundamental equilibrium is below the
economic growth rate ($R<G$), a bubbly equilibrium with $R=G$ exists. By
injecting dividends to the bubble asset that grow slower than the aggregate
economy, we can eliminate the fundamental steady state and resolve equilibrium
indeterminacy. We show the general applicability of dividend injection through
examples in overlapping generations and infinite-horizon models with or without
production or financial frictions.
