All too frequently, regulation is a scale that balances the arbitrary against the vague. Decreasing one tips the scale towards the other. According to campaign finance law, for example, a contribution of $2,100 is wholesome but a contribution of $2,101 is corrupting. No one really believes this, but arbitrariness is the price we pay for clarity.
Just as often, the scales of regulation are tipped in the other direction. Regulators will draw a line that attempts to be principled rather than arbitrary. The result is usually a regulation that is unworkably vague. One example is the line drawn by the tax code between politics and religion.
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