Economics homework help

:video link :https://util.wwnorton.com/jwplayer?type=video&msrc=/wwnorton.college.public/geology/marshak_narrative_art_videos/evolution_deserts.mp4&isrc=/wwnorton.college.public/geology/marshak_narrative_art_videos/thumbnails/evolution_deserts.jpg&csrc=/wwnorton.college.public/geology/marshak_narrative_art_videos/cc/geo-evolution-of-deserts.vtt