This article examines the formation of the Saudi middle class using econometric models and a national survey of household budget and consumption data from 44. 000 households in 2019. The study compares the spatial offset model (SAR) and spatial error model (SEM) with the Space Turbine Model (SDM) and Space Turbine Error Model (SDEM). finding that the SDM and SDEM models offer better b... https://yeswellneses.shop/product-category/nasal-care/