Cosmological evolution of comoving densities. Left: Stellar mass. Middle: UV luminosity. Right: SFR. The densities are computed based on galaxies brighter than M_UV = −17.5 or −17 as indicated in the labels. Shown are the FFB predictions for the bounding values of ϵ_max​ = ​0.2 and 1 (orange and blue respectively). Shown in comparison is the standard UM model (B19, gray). The shaded bands represent rough uncertainty estimates that correspond to varying the magnitude limits by 0.5 mag up or down. The FFB predictions are well above the UM model, starting with a small excess at z​ ∼ ​8 and growing to an order of magnitude at z​ ∼ ​12. Shown for tentative comparison are observational data (symbols). The FFB model seems to match the tentative data for UV and SFR density with ϵ_max​ ∼ ​0.2. The references include measurements of stellar density (Madau & Dickinson 2014; Papovich et al. 2023; Santini et al. 2023), UV density, and SFR density estimated from UV (McLeod et al. 2016; Oesch et al. 2018; Adams et al. 2023; Donnan et al. 2023; Harikane et al. 2023a; Pérez-González et al. 2023; McLeod et al. 2024; Finkelstein et al. 2023a; see also e.g., Coe et al. 2013; Ellis et al. 2013; Bouwens et al. 2020, 2023b,a; Robertson et al. 2023a).