The strength of a country or region's economy (impact on fertility and morality), access to health care (key factor in fertility and mortality/infant mortality: wealthier countries can provide better access to health care, advanced medical treatments, good nutrition, and clean water; can help prevent or cure disease and lower CDR), and families' decisions about childbearing & fertility rates (families tend to be larger in agriculturally based economies, where children are considered essential for labor while in indusal and post-industrial economies, children may be viewed as an economic burden/lower CBR)