边际效用递减规律

def solve(total_utilities):
    marginal_utilities = []
    for i in range(1, len(total_utilities)):
        mu = total_utilities[i] - total_utilities[i-1]
        marginal_utilities.append(mu)
    diminishing = all(marginal_utilities[i] >= marginal_utilities[i+1] for i in range(len(marginal_utilities)-1))
    return {"总效用": total_utilities, "边际效用": marginal_utilities, "符合边际效用递减": diminishing}