"赊购或赊销制度" can be translated into English as "the system of purchase or sale on credit."
Here, “赊购” is translated as “purchase on credit,” meaning buying goods or services with the agreement to pay for them at a later date. Similarly, “赊销” is translated as “sale on credit,” which refers to selling goods or services with the understanding that payment will be received at a future time. The overall term “制度” is translated as “system,” indicating a set of rules, procedures, or arrangements governing a particular activity.