atory ▁Be havior ▁and ▁R isk ▁T aking : ▁C aus es ▁and ▁Con sequ ences ▁( 1 9 9 1 ). ▁ ▁References ▁ ▁Category : L iving ▁people ▁Category : Pe ople ▁from ▁Ed mont on ▁Category : Pres idents ▁of ▁the ▁American ▁Psych ological ▁Association ▁Category : Tem ple ▁University ▁fac ulty ▁Category : Univers ity ▁of ▁Wisconsin – Mad ison ▁fac ulty ▁Category : Univers ity ▁of ▁S ask atch ew an ▁al umn i ▁Category : Al umn i ▁of ▁the ▁University ▁of ▁London ▁Category : H uman istic ▁psych olog ists ▁Category : Year ▁of ▁birth ▁missing ▁( l iving ▁people ) <0x0A> </s> ▁Price ▁on ▁application ▁( s ometimes ▁price ▁on ▁asking ), ▁more ▁commonly ▁abbre vi ated ▁as ▁PO A , ▁is ▁a ▁term ▁often ▁seen ▁on ▁price ▁lists , ▁class ified ▁advert is ements ▁and ▁is ▁commonly ▁used ▁with ▁regard ▁to ▁real ▁estate ▁prices . ▁It ▁means ▁the ▁s eller ▁or ▁s elling ▁agent ▁must ▁be ▁contact ed ▁in ▁order ▁to ▁obtain ▁the ▁price . ▁ ▁R ationale ▁A ▁numeric ▁price ▁for ▁an ▁item ▁may ▁be ▁with h eld ▁or ▁simply ▁un available ▁for ▁a ▁number ▁of ▁reasons . ▁PO A ▁can ▁be ▁used ▁as ▁a ▁placeholder ▁when ▁no ▁price ▁has ▁been ▁decided ▁yet ▁Pr ices ▁may ▁fl uct uate ▁frequently ▁( e . g . ▁gas ), ▁leading ▁to ▁a ▁price ▁given ▁in ▁a ▁publication ▁to ▁go ▁quickly ▁out ▁of ▁date . ▁A ▁product ▁may ▁be ▁highly ▁custom ised , ▁in ▁which ▁case