A rm uses only two inputs to produce its output. These inputs are perfect substitutes. This rm (Hint: if two inputs are perfect substitutes, then the TRS is always constant}. 0 could have increasing returns to scale, constant returns to scale, or decreasing returns to scale. 0 must have decreasing returns to scale in the short run and constant returns to scale in the long run. 0 must have increasing returns to scale. 0 must have decreasing returns to scale. 0 must have constant returns to scale