Penggunaan sesuatu barang secara berterusan akan menyebabkan utiliti/kepuasan yang diterima semakin berkurangan.
- Berdasarkan jadual di atas, jumlah utiliti yang diperolehi meningkat setiap tingkat apabila penggunaan bertambah.
- Namun, penambahan utiliti setiap tingkat semakin lama semakin berkurang apabila penggunaan barang X meningkat.
- Ini ditunjukkan dengan bahagian utiliti sut.
- Hukum ini juga boleh dijelaskan menggunakan keluk seperti dibawah,
- Apabila kuantiti naik kepada 9 unit, peningkatan utiliti sut semakin berkurang.
- Pada 9 unit, jumlah utiliti mencapai maksimum, manakala utiliti sut bernilai sifar.
- Apabila kuantiti lebih 9 unit, jumlah utiliti menurun, menyebabkan utiliti sut menjadi negatif.
Nash Notes 
Hi, may I know if there is an example of item to demonstrate when utiliti sut happens?
Hello there, thanks for visiting. Here’s a scenario:
Imagine yourself went for a jog and after a while, you decided to take a break and have a drink. The first bottle of water gives you the maximum utility (satisfaction). Still feeling thirsty, you decided to take the second bottle. The second bottle still gives you utility, but lesser than the first bottle. The more bottle of water you drink, the more utility you get, but in a decreasing manner until at one point, say, the 6th bottle, gives you zero utility; meaning you gain no satisfaction from drinking it. If you take the 7th bottle, not only you gain nothing from it, but it produce harmful effects to you; and thus, negative utility.
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