When overhead loads are being lowered into trenches, trench workers can be protected by?

The workers can be protected by "trench box". Trench shields which are known as Trench Boxes or Trench Sheets as well, are steel or aluminum structures utilized for securing utility laborers while playing out their obligations inside a trench. They are generally developed with sidewalls of changing thicknesses held separated by steel or aluminum spreaders.

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.