很容易选对答案，但B项读不懂，谢谢

NO.PZ202405210200000202问题如下 SusClark is aresearanalyst with BillinghAssociates, internationinvestmentaisory firm. Clark is responsible for informing the investment committee ofcurrent events in foreign economies. The investment committee relies on theinformation Clark provis to help in their asset allocation cisions. Clarkobtains a consirable amount of information through her contacts withcolleagues arounthe worlThe investmentcommittee is seeking new ways to projeeconomic scenarios anassess theireffects on locstomarkets. Clark explains to the investment committee thatthere are three major metho of economic forecasting:Ÿ econometric mols, whiarethe most formanmathematicof the three,Ÿ incators, whiare variablesthmlea lor concurrent with shifts in the economy, an the checklist approach, inwhianalyst consirs arrof economic ta.The investmentcommittee informs Clark thits members are interestein increasingallocations to bon anreestate in a number of client investmentportfolios. However, there is also a concern regarng forecasts of risingglobinflation anthe effects of this inflation on bonanreestateasset classes. Clark hbeen asketo analyze these effects.Billinghisconsiring investments in four countries thare new to its investmentportfolio. The investment committee asks Clark to provi researon thefollowing countries:Country Clark hlearnehCountry A ha government progrthuses grants, subsies antaxincentives to encourage competition anto nurture new provelopment.However, some politicians in Country A are reluctant to enrse the progranoullike the grants, subsies anincentives to receor eliminateThe investment committee wants to know wheffea cancellation of theprogrmhave on Country A’s economy.Clark’s knows thatthere are three types possible outcomes if the government progris receoreliminateType 1: Apersistent (permanent, one-time) cline in the level of output, but thesubsequent trenrate of growth is unchange Type 2: Nopersistent cline in the level of output, but the subsequent trenrate ofgrowth is rece Type 3: Both apersistent cline in the level of output ana rection in the subsequenttrenrate of growth.Country BThe investmentcommittee is consiring increasing exposure to Country B’s equity market.Clark’s analysis of Country B’s economy shows ththe country’s centrbankis pursuing inpennt monetary polianis allowing unrestrictecapitalflows. She also knows thspite the country maintaining a floating exchangerate, there is increasing pressure to establish a fixeexchange rate.Country CThe investmentcommittee is consiring investing in fixeincome instruments issuebycompanies micilein Country C annominatein Country C’s currency. BillJohnson, a member of Clark’s researgroup, hbeen askeClark to analyzeinterest rates in Country Johnson’s report incates ththe consensusopinion within the country is that, in the neterm, interest rates areexpecteto rise.Country ountry iscategorizeemerging market. The investment committee hlittleexperienin emerging market investments anhaskeClark for moreinformation. Ralph Norwoo another member of Clark’s researteam, stueountry s economy ancompilethe economic ratios listein Exhibit 1. A limitation ofthe econometric mol approafor forecasting thClark might conclu is: A.Past forecast errors cbeignoreaitionexplanatory variable into the mol.B.Econometric mols require theuser to finaquate measures (whimunavailable) for the real-worlctivities anrelationships to moleC.Relationships among the variablesrarely, if ever, change over time because of changes in economic structureanor because the mol mhave been baseon faulty assumptions to howthe economy works. Econometric molsrequire the user to finaquate measures (whimunavailable) for thereal-worlactivities anrelationships to moleAnswer Choi(A)is incorrect. Past forecast errors are incorporateinto the mol anaitionexplanatory variable. Answer Choi(is also incorrect. Relationshipsamong the variables mchange over time because of changes in economicstructure anor because the mol mhave been baseon faulty assumptions asto how the economy works. 请问c是哪种方法的weakness？