Why is it important for business travelers to understand the body language of other cultures?

In some cultures you can be killed if you even stare at someone. So when business travalers are visiting other cultures its important cause it can mean the difference between life and death. In China it is a great disrespect if you dont bow to someone who is your elder or someone higher rank in some places it can cost them their job. So if one wants to make business with them they better now how to work it cause they wiill lose their deal.