Star formation rate density from bright galaxies (M_UV < −17) as a function of density. Our fiducial model including all of the aforementioned sources of scatter is shown with the solid line and surrounding shaded regions (68% C.L.). The dashed line corresponds to the SFRD calculated using only mean relations without any scatter. Also shown are high-redshift estimates from Bouwens et al. (2020), Harikane et al. (2023), Willott et al. (2024).