Travel Retail Market Size, Share, Growth, Trends, and Global Industry Analysis: By Product Type (Perfume and Cosmetics, Wine and Spirit, Electronics, Luxury Goods, Food, Confectionery and Catering, Tobacco, and Others), By Sales Channel (Airport, Cruise Liner, Railway Station, Border, Downtown, and Hotel Shop), By Sector (Duty-Free and Duty Paid), By End Users (Children (Less Than 18 Years Old), Youth (18-30 Years Old), Middle-Aged (18-59 Years Old), and The Elder (Greater Than 60 Years Old and Region Forecast 2020-2031