How has primary sector changed over time?

the primary sector has changed over the past 30 years because there is much less people working for them and the average yearly income has increased. High degree of competition like most countries produce primary sector products and the market contains many businesses. It's very difficult for one single business to control the market and set a price. Many primary products are non-renewable: metals and minerals like copper and stone are limited in supply and will eventually be completely used up.