Đặc điểm của thị trường cạnh trạnh hoàn hảo là gì? Tại sao doanh nghiệp trong thị trường này có quyết định mức sản lượng tối ưu Q* với điều kiện MC = P (=MR) để đạt lợi nhuận tối đa, nhưng có thể bị lỗ vốn tối thiểu? Giải thích tại sao doanh nghiệp lại có đường cung (Ps) trùng với đường chi phí biên (MC) với điều kiện MC >= AVCmin? Vẽ hình minh họa?

Read the passage. the dust bowl during the 1930s, extreme drought and high winds made life incredibly difficult in the great plains region of the united states. in many areas, rainfall was forty percent less than normal. the soil became extremely dry, and when strong winds blew, they created tremendous dust storms. these so-called “black blizzards” were so thick that they made daylight seem like dusk. during this terrible period, the great plains region of the united states was named the “dust bowl.” over the next few years, the drought continued, and the winds created more dust storms. in some places, the drought and high winds lasted for eight years. many people wondered if the black blizzards would ever end. which statement about this paragraph’s main idea is true? this paragraph’s main idea is stated in the topic sentence. there are not enough details to support the main idea. this paragraph’s main idea is implied. this paragraph does not express a main idea.

Which statement are examples of ethics ? select two options

What the answer? which number is main idea? i need .