路寬 竇文章等
摘要:顯性數(shù)字與隱性數(shù)字可表示導(dǎo)致人們對(duì)數(shù)量發(fā)生認(rèn)知差異的兩類數(shù)字形式。以顯性數(shù)字和隱性數(shù)字為自變量的“主觀貨幣函數(shù)”被構(gòu)建可得出:在約束性條件下的最優(yōu)選擇中,人們的選擇結(jié)果受到貨幣形式的影響,表現(xiàn)出貨幣幻覺。比較靜態(tài)分析進(jìn)一步研究了當(dāng)約束條件發(fā)生變化時(shí),貨幣幻覺程度的變化。實(shí)驗(yàn)結(jié)果也支持了理論的關(guān)鍵假設(shè)和最優(yōu)化分析結(jié)論。
關(guān)鍵詞:主觀貨幣函數(shù);傳統(tǒng)貨幣函數(shù);貨幣幻覺;顯性數(shù)字;隱性數(shù)字;最優(yōu)化分析;價(jià)格粘性
中圖分類號(hào):F015 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-2101(2014)01-0023-05
一、文獻(xiàn)回顧
傳統(tǒng)經(jīng)濟(jì)學(xué)將其理論建立在一系列嚴(yán)格的假設(shè)之上,其中理性人假設(shè)處于核心地位。理性人具備高超的計(jì)算能力,可以準(zhǔn)確、快速地完成數(shù)字計(jì)算,而不受備選項(xiàng)外在形式的迷惑。然而貨幣幻覺的存在卻對(duì)理性人在計(jì)算能力方面的假設(shè)形成了挑戰(zhàn)。費(fèi)雪(1928)認(rèn)為貨幣幻覺源于行為者忽視購買力變化的心理錯(cuò)覺;Haberler(1941)則認(rèn)為貨幣幻覺是選擇行為違反了里昂惕夫“齊次性假設(shè)”的結(jié)果;Marschak(1943)利用多元回歸方法構(gòu)造了需求函數(shù),驗(yàn)證了貨幣幻覺的存在。Richard Dusansky和Peter J. Kalman(1974,1980)則把名義收入和價(jià)格同時(shí)引入效用函數(shù),證明了需求函數(shù)的非齊次性;Ernst Fehr和Jean R Tyran(2001,2005)認(rèn)為在給定的博弈中,即使行為者能夠通過不斷學(xué)習(xí)消除貨幣幻覺,但只要其他對(duì)手行為存在不確定性,那么貨幣幻覺仍將對(duì)均衡結(jié)果產(chǎn)生影響。在行為經(jīng)濟(jì)學(xué)領(lǐng)域中,Shafir,Diamond和Tversky(1997)認(rèn)為人們腦中的 “決策框架”使其在選擇時(shí)關(guān)注更加明顯、簡單的備選項(xiàng)。Gamble等(2002)則通過實(shí)驗(yàn)發(fā)現(xiàn)消費(fèi)者普遍傾向于認(rèn)為以大單位小數(shù)字貨幣計(jì)價(jià)的商品看上去更加便宜,以小單位大數(shù)字貨幣計(jì)價(jià)的收入看上去更豐厚。Raghubir和Srivastava(2002)發(fā)現(xiàn),人們?cè)趯?duì)以外國貨幣標(biāo)價(jià)的商品進(jìn)行估值時(shí),往往無法充分考慮匯率的影響。Desmet P和Jonas等經(jīng)濟(jì)學(xué)家(2002)通過實(shí)驗(yàn)發(fā)現(xiàn),由于歐元的價(jià)值高于馬克的價(jià)值,當(dāng)商品價(jià)格用歐元來標(biāo)識(shí)的時(shí)候,人們認(rèn)為商品變得更便宜了。Mishra et al(2006)發(fā)現(xiàn),相對(duì)于持有少量大面值的購物票,消費(fèi)者在持有總額相等但數(shù)量更多的小面值購物票時(shí)的購物意愿更強(qiáng)。
盡管行為經(jīng)濟(jì)學(xué)家的實(shí)證結(jié)果表明貨幣幻覺源于人們固有的認(rèn)知偏差,但缺乏相關(guān)的數(shù)理分析使其一直沒有被納入到經(jīng)典的經(jīng)濟(jì)學(xué)分析框架中。本文通過構(gòu)建“主觀貨幣函數(shù)”,運(yùn)用約束條件下求最優(yōu)解的方法,實(shí)現(xiàn)了對(duì)這類認(rèn)知偏差行為的數(shù)理化分析,為貨幣幻覺奠定了微觀基礎(chǔ)。
二、顯性數(shù)字與隱性數(shù)字
在主觀貨幣函數(shù)中,自變量不再是數(shù)量本身,而是表達(dá)數(shù)量的數(shù)字符號(hào),它由顯性數(shù)字和隱性數(shù)字兩個(gè)部分組成,它們的不同組合構(gòu)成了任意貨幣備選項(xiàng)。顯性數(shù)字是指相對(duì)容易辨認(rèn)的數(shù)字符號(hào)形式。例如:價(jià)格標(biāo)簽10.00美元中的“10.00”,購銷合同20 000歐元中的“20 000”等。隱性數(shù)字則是指相對(duì)較難辨認(rèn)的數(shù)字符號(hào)。例如:對(duì)于10.00美元和69.00元人民幣的兩種貨幣形式,隱性數(shù)字就是它們的匯率,其需要通過計(jì)算才能得到。如果假設(shè)美元兌人民幣的匯率恰好為6.9∶1,那么隱性數(shù)字值分別是6.9和1(或1和1/6.9)。顯性數(shù)字和隱性數(shù)字并不是兩個(gè)絕對(duì)的概念,在某種貨幣形式中是隱性數(shù)字,在另一種形式中則可能變成了顯性數(shù)字。兩者的區(qū)分依賴于給定的表達(dá)形式是否便于行為者的理解和計(jì)算。如圖1所示:22L中的“L”,在這里是隱性數(shù)字,因?yàn)樗磉_(dá)的數(shù)字含義不如“22”明顯。但是,如果寫成“貳拾貳L”時(shí),L就成了相對(duì)容易識(shí)別的顯性數(shù)字。
三、主觀貨幣函數(shù)
六、行為實(shí)驗(yàn)檢驗(yàn)
1. 行為實(shí)驗(yàn)的目的。第一,人們對(duì)于顯性數(shù)字部分和隱性數(shù)字部分的彈性隨著消費(fèi)值的增大而遞減;第二,對(duì)數(shù)量相等的備選項(xiàng),人們對(duì)顯性數(shù)字形式的敏感度大于對(duì)隱性數(shù)字形式的敏感度。
2. 行為實(shí)驗(yàn)的方法。有90名18~22歲的學(xué)生參加了該項(xiàng)實(shí)驗(yàn)。實(shí)驗(yàn)要求每個(gè)被試者都把自己設(shè)想成一個(gè)日用品零售商。一位知名洗滌液公司的營銷人員來到他們的店里,告知被試者正在為公司的新產(chǎn)品進(jìn)行容量定價(jià)調(diào)研。在調(diào)研的過程中,被試者了解到,該洗滌液公司將產(chǎn)品的容量設(shè)定在500毫升~3 750毫升,并且公司已經(jīng)為500毫升的產(chǎn)品定價(jià)為10元人民幣。他們需要做的就是為剩下的容量確定建議出售價(jià)格。問卷共分為2個(gè)類型:第一類問卷的數(shù)值用隱性數(shù)字來表達(dá),即所有容量的表達(dá)形式都是以中國漢字的形式顯示出來的,如200ml表示成“二百毫升”,2L表示成“二升”等;第二類問卷的數(shù)值則用顯性數(shù)字來表達(dá),即所有容量的表達(dá)形式都是以阿拉伯?dāng)?shù)字的形式顯示出來的,如200ml、2L等。
此外,實(shí)驗(yàn)規(guī)定了以下4個(gè)方面:第一,90人分成兩組各45人分別填寫這兩類問卷。第二,要求每個(gè)人在閱讀完實(shí)驗(yàn)材料后,必須在規(guī)定的6分鐘內(nèi)填完。由于每份問卷一共包含12個(gè)子項(xiàng),因此要求每個(gè)選項(xiàng)平均在30秒的時(shí)間內(nèi)被填寫完畢。第三,問卷里容量的數(shù)據(jù)是隨機(jī)設(shè)定的,即容量不一定是按照從小到大或者從大到小等有規(guī)律的順序列示的。第四,主觀貨幣的彈性用價(jià)格變化的百分比除以容量變化的百分比近似表示。
3. 行為實(shí)驗(yàn)的結(jié)果。根據(jù)實(shí)驗(yàn)數(shù)據(jù)計(jì)算顯性數(shù)字和隱性數(shù)字的彈性,圖3呈現(xiàn)出明顯的彈性下降趨勢(shì),并且大部分顯性數(shù)字彈性高于隱性數(shù)字彈性。通過計(jì)算,顯性數(shù)字平均彈性值為1.36,隱性數(shù)字平均彈性值為0.82。
分別對(duì)容量值和價(jià)格進(jìn)行對(duì)數(shù)換算,以價(jià)格的對(duì)數(shù)作為因變量,容量的對(duì)數(shù)作為自變量,利用SPSS進(jìn)行一元線性回歸,得到線性回歸后的系數(shù),如表1所示。顯性數(shù)字問卷的自變量系數(shù)為0.743,t=11.46,而隱性數(shù)字問卷的自變量系數(shù)為0.711,t=28.67。顯然,回歸得到的結(jié)果也表明,人們對(duì)顯性數(shù)字的敏感度高于對(duì)隱性數(shù)字的敏感度。
運(yùn)用方差分析,比較顯性數(shù)字形式和隱性數(shù)字形式下被試者對(duì)各個(gè)容量設(shè)定的平均價(jià)格結(jié)果(如表2所示)。顯性數(shù)字的洗滌液價(jià)格明顯大于隱性數(shù)字的洗滌液價(jià)格(F(2,21)=7.488,p<0.05)。此外,從圖4中我們可以發(fā)現(xiàn),隨著洗滌液容量的增大,定價(jià)的差異越來越大。因此,實(shí)驗(yàn)的結(jié)果再次驗(yàn)證了貨幣幻覺現(xiàn)象的存在,并且支持了文中關(guān)于主觀貨幣函數(shù)的彈性差異化和彈性遞減假設(shè)。
七、結(jié)論與展望
本文通過建立主觀貨幣函數(shù)并進(jìn)行約束條件下最優(yōu)化分析得出以下結(jié)論:第一,貨幣備選項(xiàng)的不同表現(xiàn)形式會(huì)對(duì)人們的選擇行為產(chǎn)生影響,對(duì)于實(shí)際值相同的不同收入形式,行為者偏愛顯性數(shù)字較大的形式;第二,貨幣幻覺的程度取決于人們對(duì)顯性數(shù)字和隱性數(shù)字敏感性的差異,當(dāng)隱性數(shù)字彈性絕對(duì)值大于顯性數(shù)字彈性絕對(duì)值時(shí),差異越大,貨幣幻覺越明顯。
未來的研究可以在以下幾個(gè)方面進(jìn)行進(jìn)一步擴(kuò)展:首先,當(dāng)選擇者面對(duì)表現(xiàn)形式更加復(fù)雜的備選項(xiàng)時(shí),如復(fù)合貨幣形式?姿n1u1+(1-?姿)n2u2,?姿?塬∈(0,1),他們的行為將會(huì)表現(xiàn)出何種特征?其次,經(jīng)濟(jì)計(jì)量工作可以被用來估計(jì)特定環(huán)境下的主觀貨幣函數(shù)參數(shù),從而有針對(duì)性地定量分析人們?cè)谠摥h(huán)境下的行為。最后,主觀貨幣函數(shù)也可以被納入到現(xiàn)代宏觀經(jīng)濟(jì)學(xué)的框架中,從而為價(jià)格粘性現(xiàn)象進(jìn)行新的解釋。
參考文獻(xiàn):
[1]Carole B. Burgoyne,David A. Routh, Anne-Marie Ellis.The Transition to the Euro:Some Perspectives from Economic Psychology[J]. Journal of Consumer Policy,1999,(22),pp.91-116.
[2]David H.Krantz,R.Duncan Luce. Patrick Suppes and Amos Tversky,F(xiàn)oundations of Measurement[M]. New York:Academic Press 1971.
[3]Desmet P. A study of the potential effects of the conversion to euro[J]. Journal of Product & Brand Management,2002,(3):pp.134-46.
[4]Edmund Cannon, Giam Pietro Cipriani. Euro-Illusion:A Natural Experiment[J]. Journal of Money,Credit,and Banking,2006,(38):1392-1403.
[5]Eldar Shafir,Peter Diamond, Tversky,A. Money Illusion[J]. The Quarterly Journal of Economics,1997,(2):pp.341-374.
[6]Ernst Fehr, Jean-Robert Tyran.“Does Money Illusion Matter?[J]. The American Economic Review,2001,(5):pp.1239-1262.
[9]James S, Dyer, Rakesh K. Sarin Measurable Multi-attribute Value Functions[J]. Operations Research,1979,(4):pp.810-822.
[10]Jonas E,Greitmeyer T,F(xiàn)rey D,Schulz-Hardt S. Psychological effects of the euro-experimental research on the perception of salaries and price estimations[J]. European Journal of Social Psychology,2002,(32):pp.147-69.
[11]Johnson EJ,Payne JW. Effort and accuracy in choice[J]. Management Science,1985,(31):pp.395-414.
[12]Kahneman D., Tversky A. On the Psychology of Prediction[J]. Psychological Review,1973,(80):pp.237-251.
[13]Kahneman,D,Amos Tverksy. Prospect Theory:An Analysis of Decision under Risk[J]. Economitrica,1979,(47):pp.263-292.
[14]Kahneman D, Slovic P, Tversky A, Judgement under Certainty:Heuristics and biases[M].Cambridge: Cambridge University Press and the Russell Sage Foundation,1982.
[15]Kahneman,D. New challenges to the rationality assumption[J]. Journal of Institutional and Theoretical Economics,1994,(150):pp.18-36.
[16]Marschak,J. Money illusion and demand analysis[J]. The Review of Economics and Statistics,1943,(1):pp.40-48.
[17]Marini G,Piergallini A,Scaramozzino P. Inflation Bias after the Euro:Evidence from the UK and Italy[R]. Working paper. Centre for Financial and Management Studies,University of London,2004.
[18]Pria Raghubir,Joydeep Srivastava. Effect of Face Value on Product Valuation in Foreign Currencies[J]. Journal of Consumer Research,2002,(29):pp.335-347.
[19]Pria Raghubir. An information processing review of the subjective value of money and prices[J]. Journal of Business Research,2006,(59):pp.053-1062.
[20]Ralph Roskies. A Measurement Axiomatization for an Essentially Multiplicative Representation of Two Factors[J].Journal of Mathematical Psychology,1965,(2):pp.266-276.
[21]Richard Dusansky, Peter Kalman. The foundations of Money Illusion in a Neoclassical Micro-Monetary Model[J]. The American Economic Review,1974,(1):pp.115-122.
責(zé)任編輯、校對(duì):武玲玲
運(yùn)用方差分析,比較顯性數(shù)字形式和隱性數(shù)字形式下被試者對(duì)各個(gè)容量設(shè)定的平均價(jià)格結(jié)果(如表2所示)。顯性數(shù)字的洗滌液價(jià)格明顯大于隱性數(shù)字的洗滌液價(jià)格(F(2,21)=7.488,p<0.05)。此外,從圖4中我們可以發(fā)現(xiàn),隨著洗滌液容量的增大,定價(jià)的差異越來越大。因此,實(shí)驗(yàn)的結(jié)果再次驗(yàn)證了貨幣幻覺現(xiàn)象的存在,并且支持了文中關(guān)于主觀貨幣函數(shù)的彈性差異化和彈性遞減假設(shè)。
七、結(jié)論與展望
本文通過建立主觀貨幣函數(shù)并進(jìn)行約束條件下最優(yōu)化分析得出以下結(jié)論:第一,貨幣備選項(xiàng)的不同表現(xiàn)形式會(huì)對(duì)人們的選擇行為產(chǎn)生影響,對(duì)于實(shí)際值相同的不同收入形式,行為者偏愛顯性數(shù)字較大的形式;第二,貨幣幻覺的程度取決于人們對(duì)顯性數(shù)字和隱性數(shù)字敏感性的差異,當(dāng)隱性數(shù)字彈性絕對(duì)值大于顯性數(shù)字彈性絕對(duì)值時(shí),差異越大,貨幣幻覺越明顯。
未來的研究可以在以下幾個(gè)方面進(jìn)行進(jìn)一步擴(kuò)展:首先,當(dāng)選擇者面對(duì)表現(xiàn)形式更加復(fù)雜的備選項(xiàng)時(shí),如復(fù)合貨幣形式?姿n1u1+(1-?姿)n2u2,?姿?塬∈(0,1),他們的行為將會(huì)表現(xiàn)出何種特征?其次,經(jīng)濟(jì)計(jì)量工作可以被用來估計(jì)特定環(huán)境下的主觀貨幣函數(shù)參數(shù),從而有針對(duì)性地定量分析人們?cè)谠摥h(huán)境下的行為。最后,主觀貨幣函數(shù)也可以被納入到現(xiàn)代宏觀經(jīng)濟(jì)學(xué)的框架中,從而為價(jià)格粘性現(xiàn)象進(jìn)行新的解釋。
參考文獻(xiàn):
[1]Carole B. Burgoyne,David A. Routh, Anne-Marie Ellis.The Transition to the Euro:Some Perspectives from Economic Psychology[J]. Journal of Consumer Policy,1999,(22),pp.91-116.
[2]David H.Krantz,R.Duncan Luce. Patrick Suppes and Amos Tversky,F(xiàn)oundations of Measurement[M]. New York:Academic Press 1971.
[3]Desmet P. A study of the potential effects of the conversion to euro[J]. Journal of Product & Brand Management,2002,(3):pp.134-46.
[4]Edmund Cannon, Giam Pietro Cipriani. Euro-Illusion:A Natural Experiment[J]. Journal of Money,Credit,and Banking,2006,(38):1392-1403.
[5]Eldar Shafir,Peter Diamond, Tversky,A. Money Illusion[J]. The Quarterly Journal of Economics,1997,(2):pp.341-374.
[6]Ernst Fehr, Jean-Robert Tyran.“Does Money Illusion Matter?[J]. The American Economic Review,2001,(5):pp.1239-1262.
[9]James S, Dyer, Rakesh K. Sarin Measurable Multi-attribute Value Functions[J]. Operations Research,1979,(4):pp.810-822.
[10]Jonas E,Greitmeyer T,F(xiàn)rey D,Schulz-Hardt S. Psychological effects of the euro-experimental research on the perception of salaries and price estimations[J]. European Journal of Social Psychology,2002,(32):pp.147-69.
[11]Johnson EJ,Payne JW. Effort and accuracy in choice[J]. Management Science,1985,(31):pp.395-414.
[12]Kahneman D., Tversky A. On the Psychology of Prediction[J]. Psychological Review,1973,(80):pp.237-251.
[13]Kahneman,D,Amos Tverksy. Prospect Theory:An Analysis of Decision under Risk[J]. Economitrica,1979,(47):pp.263-292.
[14]Kahneman D, Slovic P, Tversky A, Judgement under Certainty:Heuristics and biases[M].Cambridge: Cambridge University Press and the Russell Sage Foundation,1982.
[15]Kahneman,D. New challenges to the rationality assumption[J]. Journal of Institutional and Theoretical Economics,1994,(150):pp.18-36.
[16]Marschak,J. Money illusion and demand analysis[J]. The Review of Economics and Statistics,1943,(1):pp.40-48.
[17]Marini G,Piergallini A,Scaramozzino P. Inflation Bias after the Euro:Evidence from the UK and Italy[R]. Working paper. Centre for Financial and Management Studies,University of London,2004.
[18]Pria Raghubir,Joydeep Srivastava. Effect of Face Value on Product Valuation in Foreign Currencies[J]. Journal of Consumer Research,2002,(29):pp.335-347.
[19]Pria Raghubir. An information processing review of the subjective value of money and prices[J]. Journal of Business Research,2006,(59):pp.053-1062.
[20]Ralph Roskies. A Measurement Axiomatization for an Essentially Multiplicative Representation of Two Factors[J].Journal of Mathematical Psychology,1965,(2):pp.266-276.
[21]Richard Dusansky, Peter Kalman. The foundations of Money Illusion in a Neoclassical Micro-Monetary Model[J]. The American Economic Review,1974,(1):pp.115-122.
責(zé)任編輯、校對(duì):武玲玲
運(yùn)用方差分析,比較顯性數(shù)字形式和隱性數(shù)字形式下被試者對(duì)各個(gè)容量設(shè)定的平均價(jià)格結(jié)果(如表2所示)。顯性數(shù)字的洗滌液價(jià)格明顯大于隱性數(shù)字的洗滌液價(jià)格(F(2,21)=7.488,p<0.05)。此外,從圖4中我們可以發(fā)現(xiàn),隨著洗滌液容量的增大,定價(jià)的差異越來越大。因此,實(shí)驗(yàn)的結(jié)果再次驗(yàn)證了貨幣幻覺現(xiàn)象的存在,并且支持了文中關(guān)于主觀貨幣函數(shù)的彈性差異化和彈性遞減假設(shè)。
七、結(jié)論與展望
本文通過建立主觀貨幣函數(shù)并進(jìn)行約束條件下最優(yōu)化分析得出以下結(jié)論:第一,貨幣備選項(xiàng)的不同表現(xiàn)形式會(huì)對(duì)人們的選擇行為產(chǎn)生影響,對(duì)于實(shí)際值相同的不同收入形式,行為者偏愛顯性數(shù)字較大的形式;第二,貨幣幻覺的程度取決于人們對(duì)顯性數(shù)字和隱性數(shù)字敏感性的差異,當(dāng)隱性數(shù)字彈性絕對(duì)值大于顯性數(shù)字彈性絕對(duì)值時(shí),差異越大,貨幣幻覺越明顯。
未來的研究可以在以下幾個(gè)方面進(jìn)行進(jìn)一步擴(kuò)展:首先,當(dāng)選擇者面對(duì)表現(xiàn)形式更加復(fù)雜的備選項(xiàng)時(shí),如復(fù)合貨幣形式?姿n1u1+(1-?姿)n2u2,?姿?塬∈(0,1),他們的行為將會(huì)表現(xiàn)出何種特征?其次,經(jīng)濟(jì)計(jì)量工作可以被用來估計(jì)特定環(huán)境下的主觀貨幣函數(shù)參數(shù),從而有針對(duì)性地定量分析人們?cè)谠摥h(huán)境下的行為。最后,主觀貨幣函數(shù)也可以被納入到現(xiàn)代宏觀經(jīng)濟(jì)學(xué)的框架中,從而為價(jià)格粘性現(xiàn)象進(jìn)行新的解釋。
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[19]Pria Raghubir. An information processing review of the subjective value of money and prices[J]. Journal of Business Research,2006,(59):pp.053-1062.
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責(zé)任編輯、校對(duì):武玲玲