Feasibility of both longitudinal and international comparative studies.
It saves time.
DISADVANTAGES
Inappropriateness of the data. Data collected by oneself (primary data) is collected with a concrete idea in mind. Usually to answer a research question or just meet certain objectives this sense, secondary data sources may provide you with vast amount of information, but quantity is not synonymous of appropriateness.
The reason why it is a problem if governments continually finance goods and services with borrowed money is that eventually the interest owned on these loans will compound to a point where it becomes nearly impossible to pay back.
