Practical Sales Training™ > Lose > The Do as You Say Effect
The Do as You Say Effect
You say “I’ll send that over by tomorrow.” It sounds small. To your buyer, it’s a test.
Keep it, and you’ve proven something before you’ve even been paid. Break it, and you’ve told them what to expect from you next.
What Is It
The Do as You Say Effect is about keeping your promises. Every one, even the small ones nobody would notice straight away.
Why Does It Work
It’s easy to offer something mid conversation and forget it minutes later. Your buyer doesn’t forget. They notice, even if they never say so.
Commit to something and skip it, and the damage spreads. It touches the opportunity, your reputation, and the relationship itself. Your word needs to hold up every time.
Think about someone who let you down before. They offered to help, and nothing came of it. You think differently about that person now. Your buyer does the same with you.
How Can You Use It
Want to lose a sale fast? Promise things you can’t deliver. Say the deadline, then miss it. That’s often all it takes.
The moment you fail to follow through, you put the whole deal at risk. Not just the task you missed, but everything the buyer assumed about you because of it.
When It Works Best
This matters most early on, before a buyer has other proof you’re reliable. A kept promise in week one does more work than a polished pitch, since it’s proof instead of a claim.
It also matters in the small moments. Anyone can keep a big promise under pressure. Keeping the tiny ones, unprompted, is what builds real trust.
When It Becomes Dangerous
One missed promise rarely ends a deal by itself. But it plants doubt, and doubt compounds. Miss a second one, and your buyer stops believing what you say next.
It’s also dangerous because you might not notice you’ve done it. A forgotten follow up feels minor to you. To your buyer, it’s evidence.
Common Mistakes
Making Promises You Haven’t Thought Through
It’s tempting to offer a fast timeline just to sound helpful. Only promise what you know you can deliver. An easy yes now can cost you the whole deal later.
Assuming Small Promises Don’t Count
A missed deadline on something minor still counts. Your buyer isn’t grading you on the size of the promise. They’re grading you on whether you did what you said.
The Do as You Say Effect – An Example
Say you’re a web designer, and on a sales call you say, “I’ll send over a detailed proposal by 5pm tomorrow.”
Then you actually send it by 5pm tomorrow, without being chased for it.
Your buyer notices. You’ve proven you’re reliable before they’ve paid you a penny, and that builds trust fast. Miss that deadline instead, and you’ve lost credibility before the real conversation even starts.
See Also
