利益

1. Origins, structure, and basic meaning

• Structure: 利益 is read as りえき and is a noun for business profit or for a benefit or interest accruing to someone.
• Basic usage: Financial profit appears in 店の利益, while personal interest appears in 自分の利益.

2. Common pitfalls and similar expressions

• Profit and benefit
  • Profit suits business earnings; benefit or interest suits a broader advantage or stake.
• Difference from 売上
  • 売上 is total sales revenue, while 利益 is profit after costs or another favorable result.