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Knowledge
There is no limit.
this is the best answer
The most important quality for a student of history is a thirst for knowledge; to have a strong desire to know why, when, where, who, and how. I know this for a fact because I am a lifelong student of history.
Because monkeys do not possess the knowledge to answer questions.
It's not illegal.
A mortgage broker in Canada should possess knowledge of the real estate industry; knowing how to make a deal. It is also important to have knowledge of the area where the work is done, to be able to better help clients. A mortgage broker should also have a strong relationship with lenders and have good communications skills.
Knowledge of a particular subject or area and judgement.
Subject matter expert.
If they are a resident in the United States, if they possess a green card, and if they possess a valid work visa, then yes. A Canadian citizen with a Class I can also operate in the US, and I have seen some who, while maintaining their residence in Canada, have worked for US carriers.
An employee should have knowledge and skills in the field in which they are working. If the person is working with the public they will need to have speaking skills.
Important job skills travel agents possess include:  Good phone manners.  Attention to detail.  Basic math skills.  Geography interest and awareness.  Computer skills including Internet capabilities.  Sales knowledge and understanding.  Correct grammar and language both oral and written.