L’effetto momentum e i mercati azionari

L’effetto momentum e i mercati azionari

Ahsan Zubair

60,44 €
IVA incluido
Disponible
Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Banca
ISBN:
9786209079085
60,44 €
IVA incluido
Disponible

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La teoria finanziaria tradizionale afferma che è impossibile prevedere i prezzi futuri delle azioni e ottenere profitti anomali sulla base delle strategie di trading. Tuttavia, negli anni ’80 numerosi ricercatori hanno documentato che i prezzi delle azioni sono prevedibili sulla base dei rendimenti passati. Nel 1993, Jegadeesh e Titman hanno scoperto un momentum a medio termine nei prezzi delle azioni, in base al quale i titoli che hanno registrato rendimenti positivi in passato continuano a sovraperformare quelli che hanno registrato rendimenti negativi con un margine di circa l’1% al mese per un periodo compreso tra 3 e 12 mesi. Successivamente, numerosi studi hanno documentato che l’effetto momentum è un fenomeno mondiale. Tra le diverse possibili spiegazioni dell’effetto momentum, sembra che né le spiegazioni legate al rischio né il data snooping e la metodologia imperfetta siano in grado di fornire una spiegazione ampiamente accettata del fenomeno. La teoria della finanza comportamentale, con l’aiuto di alcuni modelli, sembra tuttavia fornire le migliori spiegazioni per l’effetto momentum. Questi modelli comportamentali sono troppo numerosi e nessuno di essi è superiore agli altri, perché ogni modello contribuisce individualmente a spiegare l’effetto momentum in mercati diversi o tipi di azioni diversi.

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