Each system is unique, yet each interacts with the others.
Limitations are important to understand for placing research findings in context, interpreting the validity of the scientific work, and ascribing a credibility level to the conclusions of published research. This goes beyond listing the magnitude and direction of random and systematic errors and validity problems.
Answer:
Countries that have a wealth of research and development and/or access to new technology often have a more productive work force than countries without access to technology. As productivity increases, economic growth increases.