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学位論文審査の結果の要旨
㸦ู⣬ᵝᘧ➨㸵ྕ㸧 Ꮫ ㄽ ᩥ ᑂᰝ ࡢ ⤖ ᯝࡢ せ ᪨ Ặ ྡ Michael Fesseha Yohannes 㸦࣑࢚࣭࢝ࣝࣇࢵࢧࣁ࣭ࣚࣁࢿࢫ㸧 ༳ ᰝ ᯇ⏣ᩄಙ ۵ ༳ ᰝ Ᏻᘏஂ⨾ ۵ ᑂ ᰝ ጤ ဨ ༳ ᰝ ෆ⏣⩏ ۵ ༳ ᰝ ᑠᯘ ୍ ۵ ༳ ᰝ ୖ᠇୍ ۵ 㢟 ┠ Demand System Analysis of Coffee in the Japanese Households 㸦᪥ᮏࡢᐙィ࠾ࡅࡿࢥ࣮ࣄ࣮ࡢ㟂せࢩࢫࢸ࣒ศᯒ㸧 ᑂᰝ⤖ᯝࡢせ᪨㸦㸰㸮㸮㸮Ꮠ௨ෆ㸧 ᮏᏛㄽᩥࡣ㸪ᶆᮏࡢ᭶ู࣭㒔ᕷูఝࣃࢿࣝࢹ࣮ࢱࢩࢫࢸ࣒ᅇᖐࣔࢹࣝࢆ㥑 ࡋ㸪᪥ᮏ࠾ࡅࡿࢥ࣮ࣄ࣮ࡢᐙィ㟂せࢆᐇドⓗศᯒࡋࡓࡶࡢ࡛㸪せ㒊ศࡣ 5 ❶ࡽ ᡂࡾ❧ࡗ࡚࠸ࡿ㸬 ࡲࡎ➨ 1 ❶࡛ࡣ㸪ᗎㄽࡋ࡚ᮏᏛㄽᩥࡢ⫼ᬒ㸪ၥ㢟ព㆑㸪ศᯒ᪉ἲ㸪࠾ࡼࡧㄽᩥࡢ ᵓᡂࢆᴫほࡋ࡚࠸ࡿ㸬 ࡘ࡙ࡃ➨ 2 ❶࡛ࡣ㸪Deaton㸦2015 ᖺࣀ࣮࣋ࣝ⤒῭Ꮫ㈹ཷ㈹⪅㸧and Muellbauer (1980)ࡢ linear approximate almost ideal demand system (LA/AIDS)ࢆᣑᙇࡋࡓ quadratic LA/AIDS (LA/QUAIDS, Matsuda, 2006)࠸࠺㟂せ㛵ᩘࡢࢩࢫࢸ࣒ᅇᖐࣔࢹࣝ㸦㟂せࢩࢫࢸ࣒㸧ࢆ⏝ ࠸㸪ࢥ࣮ࣄ࣮ࢆྵࡴ㠀ࣝࢥ࣮ࣝ㣧ᩱ 8 ရ┠ࡢᐙィ㟂せࢆ᥎ᐃࡋ࡚࠸ࡿ㸬ศᯒࡢ⤖ᯝ㸪 㠀ࣝࢥ࣮ࣝ㣧ᩱࡢ୰࡛ࢥ࣮ࣄ࣮㸦㇋ࡲࡓࡣ⢊ᮎ㸧ࡣࡸࡸዝౘ㈈ⓗᛶ᱁ࡀᙉࡃ㸪ᯝ≀࣭ 㔝⳯ࢪ࣮ࣗࢫ௦᭰㛵ಀ࠶ࡿࡇ㸪ࡲࡓ㸪ࢥ࣮ࣄ࣮㣧ᩱ㸦⨁ࡲࡓࡣ࣎ࢺࣝ㸧ࡣࡸࡸᚲ 㟂㈈ⓗᛶ᱁ࡀᙉࡃ㸪∵ங௦᭰㛵ಀ࠶ࡿࡇ࡞ࢆᐃ㔞ⓗ᫂ࡽࡋ࡚࠸ࡿ㸬 ➨3❶࡛ࡣ㸪≉Ẽ㇟せᅉࡀࢥ࣮ࣄ࣮㸪ࢥ࣮ࣄ࣮㣧ᩱ㸪⥳Ⲕ㸪⣚Ⲕ㸪Ⲕ㣧ᩱࡢ5ရ┠ࡢ ᐙィ㟂せ࠼ࡿᙳ㡪╔┠ࡋLA/QUAIDSࢆ᥎ᐃࡋ࡚࠸ࡿ㸬ศᯒࡢ⤖ᯝ㸪ࢥ࣮ࣄ࣮ࢥ ࣮ࣄ࣮㣧ᩱࡢ㟂せࡣ⮬ᕫ౯᱁ᑐࡋ࡚㠀ᙎຊⓗ࡛㸪⥳Ⲕ㸪⣚Ⲕ㸪Ⲕ㣧ᩱࡢ㟂せࡣ⮬ᕫ౯ ᱁ᑐࡋ࡚ᙎຊⓗ࡛࠶ࡿࡇ㸪 ࡃࡋ࡚㣧ࡴࡇࡀከ࠸ࢥ࣮ࣄ࣮㸪⥳Ⲕ㸪⣚Ⲕࡣᖺ㛫 ࢆ㏻ࡋ࡚Ẽ ࡀୖࡀࡿ㟂せࡀῶᑡࡍࡿࡇ㸪෭ࡓࡃࡋ࡚㣧ࡴࡇࡀከ࠸ࢥ࣮ࣄ࣮㣧ᩱ Ⲕ㣧ᩱࡣᖺ㛫ࢆ㏻ࡋ࡚Ẽ ࡀୖࡀࡿ㟂せࡀቑຍࡋ㸪ࡇ࠺ࡋࡓẼ ࡀ㟂せ࠼ࡿࣉ ࣛࢫࡢຠᯝࡣ≉ኟᏘࡁ࠸ࡇ㸪ࢥ࣮ࣄ࣮㣧ᩱⲔ㣧ᩱࡢ㟂せࡣቑຍࢺࣞࣥࢻ㸪 ࢥ࣮ࣄ࣮⥳Ⲕࡢ㟂せࡣῶᑡࢺࣞࣥࢻ࡛࠶ࡿࡇ㸪ᐙィෆࡢ 65 ṓ௨ୖேဨࡀ 1 ேቑຍࡍ ࡿࢥ࣮ࣄ࣮ࡢ㟂せࡣ⣙ 19%ῶᑡࡋ㸪⥳Ⲕࡢ㟂せࡣ⣙ 31%ቑຍࡍࡿࡇ㸪ࡲࡓ㸪ᐙィෆ ࡢ 18 ṓ௨ୖேဨࡀ 1 ேቑຍࡍࡿࢥ࣮ࣄ࣮㣧ᩱⲔ㣧ᩱࡢ㟂せࡣࡑࢀࡒࢀ⣙ 10%㸪 ⣙ 4% ቑຍࡋ㸪⥳Ⲕࡢ㟂せࡣ⣙ 12%ῶᑡࡍࡿࡇ࡞ࢆ᫂ࡽࡋ࡚࠸ࡿ㸬 ➨ 4 ❶࡛ࡣ㸪ࢥ࣮ࣄ࣮㸪ࢥ࣮ࣄ࣮㣧ᩱ㸪ႚⲔ㸦እ㣗㸧ࡢ 3 ရ┠ࡢᐙィ㟂せࡢ௦࣭᭰⿵ 㛵ಀ↔Ⅼࢆᙜ࡚࡚ LA/QUAIDS ࢆ᥎ᐃࡋ࡚࠸ࡿ㸬ศᯒࡢ⤖ᯝ㸪3 ရ┠ࡣ┦௦᭰㈈ ࡛࠶ࡿࡇ㸪ᨭฟᙎຊᛶ㠀⿵ൾ⮬ᕫ౯᱁ᙎຊᛶ㸦ࡢ⤯ᑐ್㸧ࡣ࠸ࡎࢀࡶႚⲔࡀ᭱㸪 ࢥ࣮ࣄ࣮㣧ᩱࡀ᭱ᑠ࡛㸪≉ႚⲔࡢዝౘ㈈ⓗᛶ᱁ࡀ㢧ⴭ࡛࠶ࡿࡇ㸪ࢥ࣮ࣄ࣮㣧ᩱࡢ㟂 せࡣቑຍࢺࣞࣥࢻ㸪ࢥ࣮ࣄ࣮ႚⲔࡢ㟂せࡣῶᑡࢺࣞࣥࢻ࡛࠶ࡿࡇ㸪ࡲࡓ㸪ୡᖏࡢ ᖺ㱋ࡢୖ᪼ࡶࢥ࣮ࣄ࣮ࡢ㟂せࡣቑຍࡋ㸪ࢥ࣮ࣄ࣮㣧ᩱႚⲔࡢ㟂せࡣῶᑡࡍࡿࡇ ࡞ࢆ᫂ࡽࡋ࡚࠸ࡿ㸬 ᭱ᚋ➨ 5 ❶࡛ࡣ㸪ᮏ◊✲యࡢࡲࡵ⤖ㄽࡢᥦ♧ࢆ⾜ࡗ࡚࠸ࡿ㸬 ௨ୖ㏙࡚ࡁࡓࡼ࠺㸪࣑࢚࣭࢝ࣝࣇࢵࢧࣁ࣭ࣚࣁࢿࢫẶࡢᏛㄽᩥࡣ㸪᪥ᮏ࠾ ࡅࡿࢥ࣮ࣄ࣮ࡢᐙィ㟂せ㛵ࡍࡿ3⦅ࡢ⊂❧ࡋࡓㄽᩥࡽ࡞ࡿᮏㄽ㸦➨2㹼4❶㸧㸪࠾ࡼࡧ ᗎㄽ㸦➨1❶㸧⤖ㄽ㸦➨5❶㸧ࡼࡾᵓᡂࡉࢀ࡚࠸ࡿ㸬㟂せࢩࢫࢸ࣒ࡼࡿ᪥ᮏࡢࢥ࣮ࣄ ࣮㟂せࡢศᯒࡣ㸪ᮏ◊✲ࡀึࡵ࡚࡛࠶ࡿ㸬ࡉࡽ㸪ᰂ㌾ᛶ࣭ᐇ⏝ᛶࡢ㧗࠸LA/QUAIDS ᶆᮏࡢ᭶ู࣭㒔ᕷูఝࣃࢿࣝࢹ࣮ࢱࡢ⏝ࡼࡾ㸪ศᯒࡢ⊂ᛶಙ㢗ᛶࡀ㧗ࡵࡽ ࢀ࡚࠸ࡿ㸬 ᮏㄽࢆᵓᡂࡍࡿ➨2㹼4❶ࡢᇶ♏࡞ࡗࡓㄽᩥࡣ㸪ࡍ࡛ᣦᑟᩍဨࡢᯇ⏣ᩄಙࡢඹ ⴭࡋ࡚௨ୗࡢᰝㄞࡘࡁᅜ㝿Ꮫ⾡㞧ㄅබห࠶ࡿ࠸ࡣ㏆ห࡞ࡗ࡚࠾ࡾ㸪࠸ࡎࢀࡶᏛ⾡ ⓗ༑ศ࡞ࣞ࣋ࣝ㐩ࡋ࡚࠸ࡿホ౯ࡍࡿࡇࡀ࡛ࡁࡿ㸬 ➨2❶: Journal of Agricultural Science 7: 143-153, 2015.5 ➨3❶: Agribusiness: an International Journal 32: 33-44, 2016.1 ➨4❶: Journal of Agricultural Science, ༳ๅ୰㸦2015ᖺ12᭶3᪥ཷ⌮㸧 ≉㸪➨3❶ࡢᇶ♏࡞ࡗࡓㄽᩥࡀ㸪ࢺ࣒ࢯ࣭ࣥࣟࢱ࣮ࡢࢪ࣮ࣕࢼ࣭ࣝࣜࢫࢺ㘓ࡉ ࢀࡓࣥࣃࢡࢺ࣭ࣇࢡࢱ࣮ࡁ(IF: 0.672)ࡢᅜ㝿Ꮫ⾡㞧ㄅබหࡉࢀ࡚࠸ࡿࡇࡶ㸪ᮏ Ꮫㄽᩥࡢ㉁ࢆᢸಖࡋ࡚࠸ࡿ㸬 ௨ୖࡢࡇࡽ㸪ࢃࢀࢃࢀᑂᰝጤဨ୍ྠࡣ࣑࢚࣭࢝ࣝࣇࢵࢧࣁ࣭ࣚࣁࢿࢫẶࡢᏛ ㄽᩥࠕDemand System Analysis of Coffee in the Japanese Households㸦᪥ᮏࡢᐙィ࠾ࡅࡿࢥ ࣮ࣄ࣮ࡢ㟂せࢩࢫࢸ࣒ศᯒ㸧ࠖࡀ༤ኈ㸦㎰Ꮫ㸧ࡢᏛ༑ศ್ࡍࡿุ᩿ࡍࡿ㸬