Visitors may use the Thai language in order to ask for product information and price of goods because in most countries by Thai merchant often rarely used English in communication, so it is easier to understand for both business and leisure travelers. They should know the basic terminology before arriving in Thai.
Visitors may use Thailand so easy to ask for more information and prices of goods in the country, most vendors do not always use English to communicate so that it is easier to understand about. They should know the basic vocabulary before travel to Thailand.
Tourists may use English to ask for information, products and price of the product, because the most traders don't usually use English for communication, so in order to easy understanding of tourists.