The One-Stop Request
Every service you add makes you clearer to clients who already trust you and blurrier to everyone who doesn't.

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The mechanism
The chart runs two lines as the offer grows from one thing to everything. The green line, how a client who already trusts you reads you, rises - each added service is just more convenience. The red line, how a stranger reads you, falls - each added service is one less piece of proof about what you're for. A marked stop point advises adding depth, not width. Warm buyers buy convenience and cold buyers buy evidence, and only the cold ones are reading the message that has to win them.
Part of Positioning. Who you are for and why you are the obvious choice.