This is known as the door-in-your-face technique.
It increases the chances of getting what you want by three times.
For example, if you need…
👉 An extra person to hit a deadline, ask for 2 people
👉 2 more days to complete a task, ask for 3 days
👉 £100 more budget for something, ask for £200
Don’t make your initial request unreasonable.
But if you do get pushback, you can backtrack to a lesser amount.
And the lesser amount will seem reasonable when compared to your original ask.
Thus you’re three times more likely to get what you want.