Would a 10 per cent increase in the prices of boThinputs have the same effect on a firm's budget constraint as would a 10 per cent reduction in its budget? Explain the difference between the terms...

Would a 10 per cent increase in the prices of boThinputs have the same effect on a firm's budget constraint as would a 10 per cent reduction in its budget? Explain the difference between the terms 'diminishing marginal productivity' and 'decreasing returns to scale' and their relevance to the shape of a firm's cost curves.