He cannot use deceit or manipulation. He has to reveal the blemishes to the buyer. The chat-room case is a classic example where the seller may try to convince himself that he is not doing anything wrong. Today, the secular standard has moved forward to meet Jewish ethics. The American Marketing Association states that the seller must avoid deceptive practices.
Many countries have 'truth in advertising' laws.
In the last 100 years, the secular community has begun to create regulations to entrench this norm. The world is catching up to Jewish ethics. Another question, obviously not sent by anyone who ever worked in the Israeli public sector, concerned personal telephone calls from work. The writer stated that her company limits employees to one personal phone call a day, yet seems to turn a blind eye when employees make more. She wanted to know if making more than one phone call a day is unethical.