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A graph labeled "How much you should spend on a bicycle lock, explained". The X axis is "Lock Price" and the Y axis is "Bicycle Price". The line goes up and to the right. At the top left (low lock price, high bicycle price) an area is highlighted that reads "The 'What's the point?' zone (guaranteed stolen)", and below that in the bottom left is the "More 'what's the point?' zone (no one will steal it)". At the right the function asymptotically approaches $150 and beyond that is a highlighted area reading "Completely unnecessary zone". Under the line is an integral from 0-150 calculating the area that says "Zone of wasted money".