I estimated buying beef, which I believe is the most cost-effective way of increasing animal welfare through diet
Eggs require 6.27 m2-year/​egg-kg, and ones from cages in the European Union (EU) cost 2.98 $/​egg-kg (= 2.55*1.17), so these eggs increase cropland by 2.10 m2-years per $ (= 6.27/​2.98). I got 51.6 m2-year/​$ for beef, 24.6 (= 51.6/​2.10) times my estimate for eggs from cages in the EU.
Eggs require 6.27 m2-year/​egg-kg, and ones from cages in the European Union (EU) cost 2.98 $/​egg-kg (= 2.55*1.17), so these eggs increase cropland by 2.10 m2-years per $ (= 6.27/​2.98). I got 51.6 m2-year/​$ for beef, 24.6 (= 51.6/​2.10) times my estimate for eggs from cages in the EU.