Panel of shoppers?

我想請問大家底下這幾句話的意思: 第一句和第二句話我還算了解, 但從There is a panel....那邊開始就完全霧莎莎, 它所指的panel of shoppers 是呼應第一句話裡的 controlled panels of stores 嗎? 還有by using handheld scanner at home更是讓我完全摸不著頭緒, 怎麼會在家裡使用商店才會用到的手提式掃描儀呢? Several research firms keep controlled panels of stores that have agreed to carry new products for a fee. ... 顯示更多 我想請問大家底下這幾句話的意思:
第一句和第二句話我還算了解, 但從There is a panel....那邊開始就完全霧莎莎, 它所指的panel of shoppers 是呼應第一句話裡的 controlled panels of stores 嗎? 還有by using handheld scanner at home更是讓我完全摸不著頭緒, 怎麼會在家裡使用商店才會用到的手提式掃描儀呢?

Several research firms keep controlled panels of stores that have agreed to carry new products for a fee. Controlled test marketing systems such as ACNielsen's Scantrack track individual consumer behavior for new products. There is a panel of shoppers who report all of their purchases by showing an identification card at check-out in participating stores and by using a handheld scanner at home to record purchases at nonparticipating stores.

就請各位大師多幫忙了, 謝謝
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