  A seller sells an object over time but is uncertain how the buyer learns
their willingness-to-pay. We consider informational robustness under
\textit{limited commitment}, where the seller offers a price \textit{each
period} to maximize continuation profit against worst-case information arrival.
Our formulation maintains dynamic consistency by considering the worst case
\textit{sequentially}. Under general conditions, we characterize an essentially
unique equilibrium where the buyer does not delay to learn more later.
Furthermore, we identify a condition that ensures the equilibrium price path is
``reinforcing,'' so even dynamically inconsistent information arrival would not
lower the seller's payoff below the equilibrium level.
