Roll interview) However, while Roll was doing theoretical work on asset pricing. [fact]

    Roll interview) However, while Roll was doing theoretical work on asset pricing. [fact]
  

Roll had begun by sharing the "euphoria" of the early 1970s about the model: "I was pretty much a believer in this being a panacea for everything, for asset pricing." (Roll interview) However, while Roll was doing theoretical work on asset pricing in the mid 1970s, his doubts began to grow.
Donald MacKenzie, An Engine, Not a Camera, loc. 402