I assume that you already searched for literature on this, including PubMed (http://www.ncbi.nlm.nih.gov/pubmed).

Do you want to do a health economic evaluation, such as a cost-effectiveness analysis, of medical interventions that somehow use the plants you mention?

https://scholar.google.com/scholar?hl=id&as_sdt=0%2C5&q=Wedelia+chinensis+economic&btnG=

check this out

Article WEDELIA CHINENSIS (ASTERACEAE)- AN OVERVIEW OF A POTENT MEDICINAL HERB

Hi Pushan Da,

Please search in this database, where you can get most of the Indian medicinal plants, along with their phytochemicals and related pubmed article link.

https://cb.imsc.res.in/imppat/home

@debarun Acharya. I got many literature about active ingredients and their usage of the plants, but very few of them are about their economic evaluation. Finally I was directed to e-charak which contains all data about so many Indian medicinal plants.

Thanks to everybody for intending to help me with your valuable comments and suggestions. Love and respect to all of you