Buying backlog - Kaizan

...These transactions between securities companies and securities finance companies are called lending transactions, and in a broad sense, lending transactions are also called margin transactions. In margin transactions, the state or relationship between the number of shares sold short (the number of shares sold short) and the number of shares bought short (the number of shares bought short) is called the (credit) effort. Since both short selling and short buying are destined to be traded against each other eventually, if the ratio of sold short is high, it is said to be a "good effort," and conversely, if the ratio of bought short is high, it is said to be a "bad effort." ...

*Some of the terminology explanations that refer to "unsold stock" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…この証券会社と証券金融会社との間の取引を貸借取引といい，広い意味では，この貸借取引を含めて信用取引といっている。　信用取引において，売り残(空売りされている株数)と買い残(空買いされている株数)の状態ないし関係を(信用の)取組みという。空売り･空買いともいずれ反対売買される運命にあるから，売り残の比率が高い場合，〈取組みがよい〉，逆に買い残の比率が高い場合，〈取組みが悪い〉という。…

※「買い残」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報