What makes someone turn down a billion dollars?

First establish whose billion it was

In 2006, Yahoo offered to buy Facebook for a reported $1 billion. Mark Zuckerberg did not sell.

That is the arresting version. It becomes a different story if you imagine somebody offering to transfer a billion dollars into one young man's current account.

The offer concerned a company with multiple owners. What any individual might receive would depend on ownership and deal terms, with tax and other considerations beyond the headline. A company purchase price is not a founder's personal cheque.

The distinction doesn't make the decision small. It makes it possible to understand what was actually at stake: selling the business, and with it the ability to determine its future as an independent company.

The story told afterwards

One influential account comes from Peter Thiel, an early investor and Facebook board member. Speaking at SXSW in 2013, he recalled a July 2006 board discussion involving himself, Zuckerberg and investor Jim Breyer.

According to Thiel, he and Breyer leaned towards accepting the offer. Zuckerberg did not. Thiel's recollection was that Zuckerberg expected he would use the proceeds to build another social network and preferred continuing with the one he already had. He also believed Yahoo was undervaluing what Facebook could become. Allison Fass's report of Thiel's account.

This is a participant explaining the decision seven years later. It is valuable evidence about how he remembered it, rather than a recording of every word spoken in 2006. The successful company was already visible when the story was told.

That matters because a clean anecdote can make uncertainty disappear. In the remembered version, the founder sees the future, the financiers hesitate and history supplies the applause. At the time, nobody had the completed history to consult.

What would selling have bought

An acquisition offers something very powerful: the possibility of turning uncertain future value into an agreed transaction.

For people who have spent years building a business, that can mean security, a return for investors and a reward for employees with equity. Selling is not automatically a failure of imagination. It can be a rational answer to risk, exhaustion or the limits of what a company can do alone.

But a buyer is buying something. An independent business does not simply receive money and continue with every freedom intact. Ownership, priorities and accountability change according to the agreement. Even a founder who remains involved must consider the organisation they will now belong to.

Seen that way, the decision isn't “Do you like money?” It is “Do you want this transaction more than you want the uncertain future available without it?”

Different people can answer honestly and disagree. Their responsibilities, financial positions and appetite for another decade of work may be very different.

Refusal also has a cost

Continuing independently keeps possibilities open, including unpleasant ones. A product can lose its audience. A competitor can improve. Costs can outrun revenue. A founder can be right about what people want and still fail to build a durable company around it.

There is also the effect on other people. The person most attached to the mission may not be the person carrying the greatest personal financial risk. Employees and investors can reasonably value a dependable outcome more highly than another promise of future scale.

So conviction is not sufficient evidence that a refusal is wise. You would want to know what supports the founder's expectations, what could falsify them, how the business will sustain itself and who bears the consequences if the plan fails.

Those questions do not ruin the romance of entrepreneurship. They give the decision weight. Anyone can reject a number in a motivational poster. Running the business afterwards is the substantial part.

The ending doesn't write the rule

Facebook remained independent of Yahoo and became vastly larger. Knowing that, it is easy to make the rejected offer look obviously inadequate.

But later success cannot establish that every founder should refuse an attractive bid. We hear repeatedly about the refusals that preceded spectacular growth. The businesses that declined an offer and then faded are less useful material for a triumphant conference story.

Nor does a financially successful outcome settle every question about the company that followed. An enterprise can grow enormously and still warrant criticism. Judging one transaction is not the same as endorsing its entire subsequent history.

The interesting part of Zuckerberg's decision is the preference reflected in Thiel's account: he still wanted to build that particular thing. Selling would have exchanged an unfinished project he valued for opportunities he apparently valued less.

Most of us will never receive a billion-dollar offer. We can still understand why a person might look at an extraordinary exit and see, on the other side of it, the work he would want to start again.