Don’t compete on price!
Eventually, your competitors will match your lowest price. It’s a lose-lose battle. Compete on quality of service, brand image, visibility, and user experience.
Nobody likes price wars, don’t start one!
Unless you are moving large volumes and have access to exceptional prices consistently, avoid price competition. If you really need to test a lower price without starting a price war, create a promo for the discounted product for only a few days and see how the market reacts.

