供求变动对均衡的影响

def solve(____):
    price_effect = demand_shift - supply_shift
    quantity_effect = demand_shift + supply_shift
    if price_effect > ____:
        price_change = "____"
    elif price_effect < ____:
        price_change = "____"
    else:
        price_change = "____"
    if quantity_effect > ____:
        quantity_change = "____"
    elif quantity_effect < ____:
        quantity_change = "____"
    else:
        quantity_change = "____"
    return {"____": demand_shift, "____": supply_shift, "____": price_change, "____": quantity_change}