What do police officers construction worker and school crossing guards have in common

Please be specific, but here are a few similarities.

1. They are all part of a union.   2. They all get paid $20-$60 thousand a year.   3. Their jobs can be removed using advanced AI technology withing the next 5-10 years.    4. These jobs can be found anywhere in the world.   5. They typically require specific training and on-the-job training.

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u = 30

continuing your method

= +

subtract from both sides

= - thus

= -

= ⇒ u = 30

answer; monopolistic competition;