Secondary and Primary Data Preference

Some researchers solely depend on secondary data, instead of primary data.

1. Why might this be the case?

Can you give me two examples?

THANK YOU, your HELP is GREATLY appreciated.

Secondary data means use of collection of existing data. These secondary soures could include previous research reports, newspaper, magazine and journal content, and government and NGO statistics.

When secondary data is preferrable:
It is far cheaper to collect secondary data than to obtain primary data. For the same level of research budget a thorough examination of secondary sources can yield a great deal more …

This discuses the concepts related to SECONDARY & PRIMARY DATA.