Why is this Blender model not visible?

Here’s the blender file. I tried importing it into Unity as a new asset. When I drag it into my Unity scene, it doesn’t show up. What could be causing this?

I am running the latest versions of both Blender and Unity on Mac OS X.

I tried scaling the model up in both Blender and Unity to no avail.

The model should look something like this:

My problem was that my Blender model was just a 2D curve. After converting it to a 3D mesh, I could see it in Unity.