What impact does cause and effect have on history/current events? Plz answer quickly <3

Prices for products became more affordable as a result of new forms of ,witch got things to market faster and cheaper

What would you call a political system that is only meant to last for a short time

What is the difference between a journal entry written by an eyewitness to an event and a play written about the same event? a. the journal entry is a historiographical source, while the play is a periodical source. b. the journal entry is a chronological source, while the play is a primary source. c. the journal entry is a primary source, while the play is a secondary source. d. the journal entry is a secondary source, while the play is a periodical source.