How do Hollywood producers know when stars are "bankable"? They rely on a celebrity's Q rating, which tracks how positively or negatively the American public feels about that person.

Earlier this week Popeater's Jo Piazza took a look at what's happened to Lindsay Lohan in recent years:

How has a girl once compared to a young Jodie Foster and able to generate a 300 percent return on investment for a movie as bad as 'Herbie Fully Loaded' become box office kryptonite? By making a lot of bad decisions.

We graphed LiLo's Q ratings alongside her escalating name recognition. And we don't even have the figures for 2010 yet, which certainly won't help. [Popeater]