Speedometer confusion
The number on the speedometer isn't always an indication of how fast you're getting to where you're going.
You might, after all, be driving in circles, really quickly.
Campbell's Law tells us that as soon as a number is used as the measurement for something, someone will get confused and start gaming the number, believing that they're also improving the underlying metric, when, in actuallity, they're merely making the number go up.
Here are a few measurements that are often the result of speedometer confusion:
Book sales vs. Impact
Money vs. Happiness
Twitter followers vs. Anything
Money raised vs. Votes earned
Weight vs. Health
Income vs. Skill
Facebook likes vs. Liked
Tenure vs. Competence
Length vs. Quality
Faster? How about better?