Any sales process where each customer needs a small amount of personal attention. For example, a McDonald's drive-thru customer is a very low-touch operation. The cashier only needs to guide the customer through a streamlined process, with very little individual variation. Contrast this with high-touch sales, where (at the extreme end) a 5 year lead time and several corporate jets may be involved, or with Zero-Touch sales, where software is used to take the customer's money while the business employees are asleep. A humble first product can easily achieve zero touch sales, though there is a catch: see concierge onboarding.
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