What is Buy Classes: Straight Rebuy, Modified Rebuy, New Task?
The Robinson-Faris-Wind buy-class framework distinguishes three B2B purchase situations. Straight rebuy — routine reorder of a familiar product from an approved supplier; minimal effort and short cycle. Modified rebuy — same general need but a change in price, terms, supplier, or specification; moderate effort. New task — first-time purchase of an unfamiliar product or solution; full eight-stage process with all buying-center roles active. The three classes have very different sales dynamics. Incumbents win straight rebuys easily and modified rebuys with effort; new tasks are open competitions. Smart vendors create modified-rebuy disruptions to dislodge incumbents and invest heavily in winning new-task accounts.
How Buy Classes: Straight Rebuy, Modified Rebuy, New Task actually works
The framework breaks down into the following moving parts. Knowing what each piece is — and what it is not — is what separates a B-grade answer from an A-grade answer in a written assignment.
- Straight rebuy — automated reorder, minimal sales effort
- Modified rebuy — price change, supplier change, or spec change reopens the decision
- New task — full eight-stage process, multiple buying-center roles, longest cycle
- Incumbents prioritize protecting straight rebuys
- Challengers create modified-rebuy events to compete
A worked example: Office supplies vs cloud platform
Office supplies (paper, ink, basic furniture) are usually straight rebuys — once a company is set up with Staples Business Direct, the reorder happens monthly with little vendor competition. A cloud platform (AWS to Azure) is a new task or modified rebuy — the buying center reactivates, security review reopens, contract renegotiation begins, and AWS competes against Azure and Google Cloud. The sales investment per dollar of revenue is wildly different — Staples spends pennies on a rebuy, AWS spends thousands on a new-task close.
Don't lose marks for these
- Confusing modified rebuy with new task
- Investing high-touch sales on straight rebuys
- Treating an account renewal as automatic when contracting changes can convert it to modified rebuy
How to use this on the exam
Score-maximizing moves
- Cite Robinson, Faris, Wind
- Match sales effort intensity to buy class
- Identify the events that convert one class to another
When to use Buy Classes: Straight Rebuy, Modified Rebuy, New Task (and when not to)
Use Buy Classes: Straight Rebuy, Modified Rebuy, New Task when your assignment asks you to analyze, structure, or recommend — and when you have at least two data points to populate every cell of the framework. Skip it when the question is asking for a numerical answer or a single recommendation, since Buy Classes: Straight Rebuy, Modified Rebuy, New Task is a structuring tool, not a calculator.