To start the simulation, click on START.

A tool-maker takes half a day to make a tool which saves him five days of work over the twenty day lifetime of the tool. The rolling graphic display shows his idleness on each day, with idleness falling every 20 days as he makes a new tool to replace its worn-out predecessor.

With untooled idleness = 10%, the use of this tool increases his idleness by (V-C)/L or 0.375 or 37.5% to 47.5%

After 300 days, the rolling graphic display switches to showing average idleness over the past 50 days. This smoothes out the glitches, and shows

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