▁not ▁appear ▁on ▁the ▁market ▁very ▁often , ▁the ▁determ ination ▁of ▁changes ▁in ▁market ▁value ▁prove ▁difficult ▁to ▁determine . ▁ ▁Econom ists ▁use ▁the ▁h ed onic ▁regression ▁( HR ) ▁estimation ▁method ▁to ▁calculate ▁prices ▁in ▁art . ▁ ▁This ▁is ▁used ▁to ▁predict ▁prices ▁based ▁on ▁various ▁attributes ▁of ▁the ▁art work ▁such ▁as ▁its ▁dimensions , ▁the ▁artist , ▁and ▁the ▁subject ▁matter ▁attended ▁to . ▁ ▁Prote ction ism ▁vs . ▁Liberal ization ▁▁ ▁Prote ction ism ▁is ▁a ▁national istic ▁view point ▁that ▁cont ends ▁that ▁a ▁health y ▁cultural ▁industry ▁is ▁necessary ▁to ▁assert ▁national ▁so vere ig nt y ▁and ▁identity . ▁ ▁Count ries ▁with ▁small ▁domestic ▁mark ets ▁are ▁often ▁over wh el med ▁by ▁imports ▁from ▁larger ▁mark ets ▁in ▁which ▁produ cers ▁can ▁make ▁up ▁their ▁costs ▁of ▁production ▁by ▁dump ing ▁content ▁abroad . ▁ ▁America ▁is ▁the ▁largest ▁exp orter ▁of ▁art work ▁in ▁the ▁world , ▁and ▁English ▁speaking ▁countries ▁are ▁especially ▁vulner able ▁to ▁American ▁imports . ▁Prote ction ists ▁view ▁this ▁as ▁a ▁modern ▁form ▁of ▁American ▁imperial ism , ▁which ▁reduces ▁cultural ▁divers ity ▁when ▁national ▁indust ries ▁are ▁unable ▁to ▁comp ete . ▁ ▁Prote ction ism ▁is ▁less ▁concerned ▁with ▁direct ▁economic ▁interest ▁as ▁it ▁is ▁with ▁pres erving ▁cultural ▁integrity . ▁ ▁Australian ▁econom ist ▁David ▁Th ros by ▁arg ues ▁that ▁invest ment ▁in ▁" c ult ural ▁capital " ▁may ▁be ▁necessary ▁for ▁the ▁sust ain ability ▁of ▁a