To quote from our textbook (Marketing in the 21st Century): “In any marketing situation, ethical behavior based on honest and proper conduct (‘what is right’ and ‘what is wrong’) should be followed. This applies both to situations involving company actions that affect the general public, employees, channel members, stockholders, and/or competitors and to situations involving company dealings with consumers. For each ethically questionable issue, the person considers alternative actions, makes a decision, and acts accordingly. He or she then faces the consequences, which affect future decisions.”
Here is an interesting (and fun) video on the role of ethics when conducting research. Unfortunately, sometimes, research results are fudged because there is pressure to show a certain desired result.