 So dilation can perhaps be tamed or rationalised, and the issue with reflection can be mitigated. But there is still a puzzle that dilation raises: in the precise context we have a nice result – due to Good (1967) – that says roughly that learning new information has positive expected value. Information has positive value. This result is, to some extent, undermined by dilation. Bradley and Steele (2016) suggest that there is  some sense in which Good’s result can be partially salvaged in the IP setting. 