During the very early days of a business, in stage one, decisions are made which determines the initial trajectory of a business. While you can always pivot and change direction, every pivot costs resources.
In the early stages of a business, you don’t have much in the way of resources, so limiting the number of pivots is directly related to efficiency.
Here’s some counsel I recently provided to a couple of engineers who have an early stage Big Data startup:
You are currently early in stage one here: www.IdeaToExit.com. You have made some preliminary decisions regarding the business model, but have yet to progress through the most important stage one section: market sizing.