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Dynamics of independent Geometric Brownian Motions under risk-neutral measure Q

Suppose I have two Geometric Brownian motions and a bank account: $$dB_t=rB_tdt$$ $$ dS=S(\alpha dt + \sigma dW_t) $$ $$ dY = Y(\beta dt + \delta dV_t) $$ Where $dW_t$ and $dV_t$ are independent Wiene …
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