Limiting imports

https://youtu.be/fhp5L76OEPA   What are imports? Why limit imports? How would a city or region that imported less benefit from limiting imports? What types of products could be more locally produced? Why? How? In what other areas would self-reliance be a good idea? (other "essentials") What are local examples of self-reliance or import substitution? (farmers' markets, local fairs with local products) Does self-reliance mean no trade? In what ways do current laws/regulations make it difficult for businesses to stay local (not export) their labor/resources/businesses? Be Specific.