What can you determine with certainty about an upward$-$sloping yield curve according to the liquidity premium theory? Future $1-$year rates will be the same as today's $1-$year rate Future $1-$year rates will be higher than today's $1-$ year rate Longer $-$term rates are higher than shorter $-$term rates today Future $1-$year rates will be lower than today's $1-$year rate