Which of the following is an essential aspect of handling products to reduce shrink?

Regularly checking for damages is an essential aspect of handling products to reduce shrink because it allows for the identification and removal of any items that may be unsellable due to spoilage or physical damage. This proactive approach minimizes potential losses by ensuring that only high-quality, intact products remain available for sale. By routinely inspecting inventory, staff can address issues before they impact overall stock levels or lead to financial loss. This practice not only helps maintain the store's reputation for quality but also supports effective inventory management, ultimately contributing to better profitability.

The other options might seem relevant but do not directly relate to effective shrink management. For instance, using old stock first (first-in, first-out principle) is important for perishable items but is not the primary method of damage management. Underpricing items can lead to immediate sales but does not address quality concerns or loss prevention. Stockpiling products can lead to spoilage, increased costs, and potential waste if items are not sold in a timely manner.