After-sales service is the bundle of support a buyer receives after purchase, such as repairs, maintenance, updates, warranties, and spare-parts access.
Why it matters economically
Buyers do not compare products using sticker price alone. They also care about expected repair costs, downtime, resale value, and how easy it is to get service. That means after-sales service affects demand, market power, and competition in durable-goods markets.
Total cost of ownership
A simple way to express the idea is:
$$ TCO = P_0 + \sum_{t=1}^{T} \frac{\mathbb{E}[m_t] + \mathbb{E}[d_t]}{(1+r)^t} $$
Here (P_0) is the purchase price, (m_t) expected maintenance cost, and (d_t) expected downtime or hassle cost. Better after-sales service lowers expected lifetime cost and can justify a higher upfront price.
Competition effects
After-sales service can improve markets when it signals quality and reduces buyer uncertainty. But it can also be used to create lock-in through expensive repairs, restricted parts, or proprietary servicing networks. That is why economists often connect after-sales service to information asymmetry and market power.