Chatterji, Pinka; Ho, Chun-Yu; Jin, Tao; Wang, Yichuan - National Bureau of Economic Research - 2024
in PDPs, and higher PDP market concentration increases OOP drug expenditures. Our main results are robust to considering … variety and have higher OOP drug expenditures in response to increased PDP market concentration compared to the latter groups …. Finally, we find that not only do lower PDP variety and greater PDP market concentration directly affect PDP enrollment and …