<prompt> Translate the following text to EnglishKama ilivyoelezwa hapo juu, Mkakati wote wa Cook umejengwa juu ya kanuni kwamba inawezekana kutabiri, kwa muda mfupi, wakati hisa zitaongezeka na kushuka.  <response>: But Cooks entire strategy is built on the principle that its possible to predict, in the short term, when stocks will rise and fall. 