The efficient scale is were firm try to operate because is the lowest scale or the lowest point of the long run average cost to achieve economies of scale. Economies of scale is when a firm operates at a point in which it is efficient (produces at the minimum cost) and the price of its good is competitive. The figure shows the minimum efficient scale point which is placed on the LRAC (Long-Run-Avergare-Cost). Before that point the firm is producing at a competitive price but not at the minimum cost. After that point it is producing at a competitive price but at a cost that is too low.
To deal with the traffic growth in a cost-effective manner, the architect should Add Auto Scaling to the Amazon EC2 backend fleet and Replace both the frontend and reverse proxy layers with an ELB Application Load Balancer.
Classic load balancer isn't compatible with path/host-based routing. So it can not replace reverse proxy.
A Party wall which sometimes also called a parting wall is referred to that wall which is used or shared by both property owners. The purpose of this wall is to separate the two adjoining owners, therefore, thickness varies from 9 to 12 inches. Party wall agreement need to signed between both sharing owners to make any repair work on the party wall.