RDP 9601: Why Does the Australian Dollar Move so Closely with the Terms of Trade? Equation (9)

q t+k q t =α+β E t x ( q t+k q t )+ ε t+k,t , x=A,B MathType@MTEF@5@5@+=feaagCart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqbaeqabeGaaaqaaiaadghadaWgaaWcbaGaamiDaiabgUcaRiaadUgaaeqaaOGaeyOeI0IaamyCamaaBaaaleaacaWG0baabeaakiabg2da9iabeg7aHjabgUcaRiabek7aIjaadweadaqhaaWcbaGaamiDaaqaaiaadIhaaaGcdaqadaqaaiaadghadaWgaaWcbaGaamiDaiabgUcaRiaadUgaaeqaaOGaeyOeI0IaamyCamaaBaaaleaacaWG0baabeaaaOGaayjkaiaawMcaaiabgUcaRiabew7aLnaaBaaaleaacaWG0bGaey4kaSIaam4AaiaacYcacaWG0baabeaakiaacYcaaeaacaWG4bGaeyypa0JaamyqaiaacYcacaWGcbaaaaaa@59DE@