Every person having a license under the provisions of this Chapter for carrying on a business at a fixed place of business, shall exhibit such license in some conspicuous part of the place of business. Every person having such a license and not having a fixed place of business shall carry such license with him at all times while carrying on the business for which the same was granted. Every person having such a license shall produce and exhibit same whenever requested to do so by any police officer or by any officer authorized to issue, inspect or collect licenses.