You can find it in market survey reports done by agencies and individual companies in developing countries. Maybe government reports if they have done any surveys with reference to consumers

consumer information in vital for positioning of the product in any market. the consumer related information can either be collected to particular market in developing countries or the text book written in the developing country context or may be collected from the government report  published from consumer behaviour and lifestyle context.. some of the market research organisation in India includes

IMRB International

Majestic MRSS

RNB Research

AC neilson and ORG marg

Through industry report of that country or already done research in that industry

I am absolutely agree with Dr. Dhabi. Shanker Chaubey. Observation and Exploratory Research are the best tools.

Thanks a lot for your anwers

Hello William Menvielle

please check the pdf and links

http://www.acrwebsite.org/volumes/11456/volumes/e01/E-01

http://bmcpublichealth.biomedcentral.com/articles/10.1186/1471-2458-13-829

Dear William Menvielle,

Look the links, may be useful.

https://wearedevelopment.net/2011/11/01/10-consumer-behavior-differences-between-developed-and-developing-countries/

http://sambuno.com/consumer-behavior-differences-developed-developing-countries/

Regards, Shafagat