• Merck average return on investment for 2023 was 8.27, a 19.4% decline from 2022.
• Merck average return on investment for 2022 was 10.26, a 1.79% decline from 2021.
• Merck average return on investment for 2021 was 10.08, a 52.27% increase from 2020.

Roi - return on investment can be defined as an indicator of how profitable a company is relative to its assets invested by shareholders and long-term bond holders. Calculated by dividing a company's operating earnings by its long-term debt and shareholders equity.