Restaurants do not typically refrigerate everyday bottles of soy sauce because the high concentration of sodium and the natural fermentation process create a stable, hostile environment for harmful bacteria, germs, and spoilage microorganisms. Furthermore, because soy sauce is consumed rapidly in high-volume restaurant settings, bottles are emptied and refilled frequently. Keeping them at room temperature on dining tables or prep stations maintains convenience, preserves the liquid's pouring consistency, and eliminates any necessity for bulky refrigeration space.