AMAZON SERVICE PRACTICES

1. What types of scheduling techniques AMAZON use to ensure the timely and profitable delivery of services to their clients (e.g., some companies schedule customer deliveries by postal code).
2. Is there any cost to deliver services? (i.e., such delivery must be profitable or the company will fail).
3. Provide recommendations on how AMAZON may improve their service performance(s).

Please answer in detail with explanation. Thank you.