Ameba DSPのOpen-Auctionにおける入札戦略

by Yoshitomo Hayashi

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"NFCB%41ͷ 0QFO"VDUJPOʹ͓͚Δ ೖࡳઓུ ΦϨγΧφΠτWPM

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ྛ ۍ๎ʢHayashi Yoshitomoʣ w ॴଐ גࣜձࣾαΠόʔΤʔδΣϯτ ϝσΟΞ౷ׅຊ෦ΞυςΫϊϩδʔάϧʔϓ w ৬छ αʔόʔαΠυΤϯδχΞ w झຯ ίʔώʔΞχϝεϚϒϥ

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ϓϩμΫτͷ঺հ 0QFO"VDUJPOʹ͓͚Δೖࡳઓུ 4FDPOE1SJDF"VDUJPOͷೖࡳઓུ 'JSTU1SJDF"VDUJPOͷೖࡳઓུ ·ͱΊ

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ϓϩμΫτ঺հ

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ϓϩμΫτ঺հ "NFCB

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"NFCB*OGFFE "NFCB ྑ࣭ͳࣗࣾϝσΟΞ࿮΁ͷ޿ࠂ഑৴͕Մೳ "NFCBͷΦʔσΟΤϯεσʔλΛ׆༻ͨ͠ ഑৴͕Մೳ

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"NFCB%41 "NFCB ֎෦ϝσΟΞ 0QFO35#Ͱ441ͱ઀ ଓ͢Δ͜ͱͰ֎෦ͷ༷ʑ ͳϝσΟΞʹ഑৴Մೳʹ 441 ֎෦ϝσΟΞ ֎෦ϝσΟΞ

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"NFCB%41ͷ ϓϩάϥϚςΟοΫऔҾ

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ϓϩάϥϚςΟοΫऔҾͷछྨ 35# /PO35# छྨ 0QFO"VJDUJPO *OWJUBUJPO0OMZ "VDUJPO 6OSFTFSWFE'JYFE 3BUF "VUPNBUFE (VBSBOUFFE ࡏݿ༧໿ ͳ͠ ͳ͠ ͳ͠ ͋Γ ΦʔΫγϣϯ ͋Γʢೖࡳʣ ͋Γʢೖࡳʣ ͳ͠ʢݻఆ୯Ձʣ ͳ͠ʢݻఆ୯Ձʣ ޿ࠂ࿮ʢࡏݿʣ ͷ඼࣭ ௿ʙߴ தʙߴ ߴ ߴ ࡏݿྔ ଟ த গ গ Ձ֨ ௿ʙߴ தʙߴ ߴ ߴ ࡏݿͷ༏ઌ౓

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"NFCB%41͕ରԠ͍ͯ͠Δ΋ͷ 35# /PO35# छྨ 0QFO"VJDUJPO *OWJUBUJPO0OMZ "VDUJPO 6OSFTFSWFE'JYFE 3BUF "VUPNBUFE (VBSBOUFFE ࡏݿ༧໿ ͳ͠ ͳ͠ ͳ͠ ͋Γ ΦʔΫγϣϯ ͋Γʢೖࡳʣ ͋Γʢೖࡳʣ ͳ͠ʢݻఆ୯Ձʣ ͳ͠ʢݻఆ୯Ձʣ ޿ࠂ࿮ʢࡏݿʣ ͷ඼࣭ ௿ʙߴ தʙߴ ߴ ߴ ࡏݿྔ ଟ த গ গ Ձ֨ ௿ʙߴ தʙߴ ߴ ߴ ࡏݿͷ༏ઌ౓

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0QFO"VDUJPOʹ͓͚Δ ೖࡳઓུ

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ͦͷલʹ ࠓճͷൃද͸ʮ$"#"4&$".1ʯͰࣾ಺޲͚ʹ࿩ͨ͠಺༰Λೖࡳઓུ ʹಛԽͯ͠ϦϥΠτͨ͠಺༰Ͱ͢ɻ ༧ଌपΓ౳ͷ಺༰͸ԼهͷϒϩάΛޚཡ͍ͩ͘͞ɻ $ZCFS"HFOU%FWFMQFST#MPH ʮਐԽ͢Δ޿ࠂ഑৴ϩδοΫͱ%41ઓུc$"#"4&$".1ʯ

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ΦʔΫγϣϯͷ͘͠Έ %41" %41# %41$ SSP ೖࡳֹԁ ೖࡳֹԁ ೖࡳֹԁ Ұ൪ߴ͍ೖࡳֹΛఏࣔͨ͠%41͕ΦʔΫγϣϯʹউར͠޿ࠂ഑৴ͷݖརΛಘΔ ࢧ෷͍ ΦʔΫγϣϯछྨຖͷ441΁ͷࢧ෷ֹ͍ 'JSTU1SJDF"VDUJPOʢ'1"ʣ ˠೖࡳֹʢԁʣ 4FDPOE1SJDF"VDUJPOʢ41"ʣ ˠҐͷೖࡳֹʢԁʣ ೖࡳઓུ͸ΦʔΫγϣϯͷछྨ͝ͱʹߟ͑Δɻ

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ೖࡳֹͷܭࢉ ೖࡳ$1.$53 ༧ଌ º$1$ $1"º$73 ༧ଌ º NBSHJO DSP ೖࡳֹ $1. ࢧ෷͍ ച্ Ϛʔδϯԁ 80ԁ 100ԁ 441 ޿ࠂओ ˞޿ࠂओ͸࣮ࡍʹ͸ΫϦοΫ՝ۚ ˞Ϛʔδϯ཰͸ྫͰ͢

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ϚʔδϯͱΦʔΫγϣϯউ཰ ϚʔδϯΛߴ͘ઃఆ͗͢͠Δͱೖࡳֹ͕Լ͕ΓΦʔΫγϣϯͷউ཰͕Լ͕Δɻ ϚʔδϯΛͲ͏ઃఆ͢Δ͔͕ೖࡳઓུΛߟ͑Δ্Ͱॏཁʂ ΦʔΫγϣϯͷউ཰ Ϛʔδϯ ߴ ௿ ೖࡳֹ

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ΦʔΫγϣϯछྨຖͷೖࡳઓུ

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'JSTU1SJDF"VDUJPO

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'JSTU1SJDF"VDUJPO %41" %41# %41$ 441 ೖࡳֹԁ ೖࡳֹԁ ೖࡳֹԁ Ұ൪ߴ͍ೖࡳֹΛఏࣔͨ͠%41͕ΦʔΫγϣϯʹউར͠ɺͦͷֹۚΛ441ʹࢧ෷͏ɻ ࢧ෷ֹԁ

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'JSTU1SJDF"VDUJPOͷೖࡳઓུ '1"ͷ৔߹ɺ ೖࡳֹࢧ෷ֹͳͷͰϚʔδϯૈརͱͳΔɻ ࣾ໨ͷೖࡳֹϓϥεԁʹೖࡳֹΛઃఆͰ͖Δ ͱૈར͕࠷େʹͳΔͷͰɺࣾ໨ͷೖࡳֹΛਖ਼ ֬ʹ༧ଌ͍ͨ͠ɻ ˠXJOQSJDF༧ଌΛ༻͍ͨೖࡳઓུ $1.ʢԁʣ ೖࡳֹ ʢԁɿࢧ෷ֹʣ Ϛʔδϯ ࣾ໨ͷೖࡳֹ ʢԁʣ ૈར ཧ૝తͳೖࡳֹ ʢԁɿࢧ෷ֹʣ

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4FDPOE1SJDF"VDUJPO

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4FDPOE1SJDF"VDUJPO 0QFO"VDUJPOͰ͸ओʹ4FDPOE1SJDF"VDUJPO͕࠾༻͞Ε͍ͯΔɻ Ұ൪ߴ͍ೖࡳֹΛఏࣔͨ͠%41͕ΦʔΫγϣϯʹউར͢Δ͕ɺࢧ෷͏ֹۚ͸൪໨ʹߴ͍ೖ ࡳֹͱͳΔɻ %41" %41# %41$ 441 ೖࡳֹԁ ೖࡳֹԁ ೖࡳֹԁ ࢧ෷ֹԁ

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4FDPOE1SJDF"VDUJPOͷೖࡳઓུ 441ʹࢧ෷͏ֹ͸൪໨ͷೖࡳֹʹͳΔͷͰɺ ࢧ෷ֹ͸ࣗ෼ͷೖࡳֹΑΓৗʹ௿͘ͳΔɻ ϚʔδϯΛ࠷௿ݶʹઃఆ͢Δ͜ͱͰɺউ཰ͱૈ ར͕࠷େԽ͢Δ͕ɺ༨৒Ϛʔδϯ͕ൃੜͯ͠͠ ·͏ɻ $1.ʢԁʣ ೖࡳֹʢԁʣ Ϛʔδϯ ࣾ໨ͷೖࡳֹ ʢԁɿࢧ෷ֹʣ ૈར

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༧ଌޡࠩΛߟྀͯ͠ϚʔδϯΛઃఆ͢Δ F$1.ʢԁʣ Ϛʔδϯ ࣾ໨ͷೖࡳֹ ʢԁɿࢧ෷ֹʣ ࣮ࡍͷ$1. ʢԁʣ ଛࣦ ೖࡳֹ͸༧ଌʹΑͬͯܭࢉ͍ͯ͠ΔͷͰɺೖࡳ࣌ʹ ༧ଌͨ͠F$1.ΑΓ࣮ࡍͷ$1.͕௿͔ͬͨ৔߹͸ ଛࣦͱͳΔՄೳੑ͕͋Δɻ ߴ͗͢Δ༧ଌ$1. ˠଛࣦͷϦεΫ͕͋Δ͕ɺϚʔδϯΛ༧ଌޡࠩҎ্ʹઃఆ͢Δ͜ͱ ͰଛࣦͷϦεΫΛແ͘͢͜ͱ͕Ͱ͖Δɻ ௿͗͢Δ༧ଌ$1. ˠଛࣦͷϦεΫ͸ͳ͍͕ɺ࣮ࡍʹ͸΋ͬͱೖࡳֹΛߴ͘Ͱ͖ΔͷͰ ػձଛࣦͷՄೳੑ͋Γɻʢ༨৒Ϛʔδϯ͕ൃੜ͢Δʣ ೖࡳֹʢԁʣ

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༨৒Ϛʔδϯ্৐ͤೖࡳ w 41"΍༧ଌޡࠩʹΑͬͯऔΓ͗ͨ͢ϚʔδϯΛೖࡳ$1.ʹ্৐ͤͯ͠ΦʔΫγϣϯͷউ཰Λ্͛Δ w 1*%੍ޚͱ͍͏ख๏Λ༻͍ͯૈར཰͕ઃఆ஋ʹͳΔΑ͏ʹೖࡳ$1.Λܭࢉ ※ ޡࠩʹ൓Ԡ͠΍͍͢Α͏ʹࢦ਺ؔ਺Λ࠾༻

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·ͱΊ

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·ͱΊ w 'JSTU1SJDF"VDUJPOͷ৔߹ɺࣾ໨ͷೖࡳֹΛਖ਼֬ʹ஌Δ͜ͱ͕Ͱ͖Ε͹ɺ ΦʔΫγϣϯউ཰Λอͪͳ͕ΒૈརΛ࠷େԽͰ͖Δɻ w 4FDPOE1SJDF"VDUJPOͷ৔߹ɺϚʔδϯΛ༧ଌޡࠩΛߟྀ͠ͳΔ΂͘௿͘ ઃఆ͢Δ͜ͱͰΦʔΫγϣϯউ཰ͱૈརΛ࠷େԽͰ͖Δɻ w 4FDPOE1SJDF"JVDUJPO΍༧ଌޡࠩͳͲʹΑͬͯऔΓ͗ͨ͢Ϛʔδϯ͸ɺೖ ࡳֹʹ্৐ͤ͠ΦʔΫγϣϯউ཰Λ্͛ͯ഑৴ྔΛ૿΍͢͜ͱͰ޿ࠂओʹؐ ݩ͍ͯ͠Δɻ

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠