Wait! Don’t build that fence along our southern border just yet. We may not really need it any more than we need one on the northern border with Canada. In order to fix the problem of illegal immigration we must first understand why we have an estimated 12 million illegals in the United States. A Risk-Benefit Analysis model provides insight into both the causes of the problem and the solution to it.

We all make risk-benefit decisions every day. “Should I have the apple or the cheeseburger for lunch?” Or, “Should I send a Tweet with a risqué photo of myself to that young coed?” Millions of people on our northern and southern borders face the decision to enter the United States illegally, but we don’t have a fence with Canada because we don’t need one. Canadians are not streaming into the USA demanding ice cold Molson beer and raising maple leaf flags in front of public schools. Why not? It’s simple: Canadians enjoy a good quality of life at home, so the perceived benefit in coming here illegally is not worth the risk.

But the same is not true for our southern neighbors. Life in Central and South America is…well…bleak. America sits like a shimmering jewel on the horizon where benefits abound: healthcare, education, citizenship, and jobs, to name a few. The risk in coming here is perceived to be low in comparison to the benefits to be had. So they come. Politicians puff out their chests, call it an outrage, and demand fences be built. Unfortunately, fences have never worked in the past. But we’re ignoring the obvious solution: end the benefits, ratchet up the risk, and we won’t need a fence for the same reason we have none with Canada.

Let’s look at some of the benefits we provide to non-U.S. citizens and consider some solutions:

If we were to eliminate the benefits to be gained by illegally entering the United States, while increasing the risk in coming here, we could solve the illegal immigration problem without a fence. These benefits are the causes of the problem, and their removal is the solution. Building the fence would only slow down the departure. We welcome legal immigrants, and we should reserve the benefits of citizenship for those willing to get in line and knock politely on the front door.