What are the big 3 pharmacy chains?
As a keen observer of the retail pharmacy industry, I'm curious to know which pharmacy chains dominate the market. Could you elaborate on the "big 3 pharmacy chains" and their significance in the sector? Specifically, I'm interested in their market share, growth strategies, and any unique services or products that set them apart from their competitors. Additionally, I'd like to understand how these chains have adapted to the evolving landscape of digital healthcare and cryptocurrency-enabled transactions. I believe this information would provide valuable insights into the current state and future trends of the pharmacy retail industry.