Please help thank you

1. How can occupational licensingaffect the diversity of goods and services available to people?
2. Are there any instances where requiring an occupational license would be beneficialto the market?
3. Are there any instances where requiring an occupational license would be harmful to the market?
4. If government did not require or offer occupational licensing of any kind, could markets provide consumers with the assurance that they are receiving a minimal level safety? Explain.