Which of the following is true about absolute advantage principle? this is the only approach that can be used to explain why nations attempt to run a trade surplus. according to this approach, enhanced product specialization adversely affects communal welfare. this approach explains the process by which firms acquire and retain one or more value-chain activities inside the firm. this approach allows the nation to consume more than it otherwise could, generally at lower cost.

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?

Arthur met rottweiler breeders lynda and george at a dog show in rhode island. the couple, who reside in new york state, later sold several rottweiler dogs to arthur who lived in rhode island. arthur later sued lynda and george, claiming that the dogs were sick and infirm. he filed a complaint in rhode island courts, claiming that even though the dogs were sold in new york, the breeders had attended the dog show and advertised in the rottweiler newsletter which was distributed at the event in rhode island. based on the facts, do you think rhode island courts have personal jurisdiction in this case?

Where is sub-saharan africa located?