[citation needed] Fischer is a senior research manager at Rethink Priorities[3] and, along with Mark Budolfson and Lisa Kramer, a director of the Animal Welfare Economics Working Group.
Key to Fischer's account is that abductive reasoning (such as appeals to the virtue of simplicity) is well-placed to help agents to identify the theories that they are justified in believing.
Interspecies welfare comparisons involve estimating the relative well-being levels of members of different species.
For instance, if someone judges that a chicken in a battery cage is worse off than a human living a normal life, that person is making an interspecies welfare comparison.
The book shows how it may be possible to make such comparisons by finding a mix of behavioral and physiological proxies for possible differences in the intensities of valenced experiences (like pleasure and pain).