Final answer:
Option D (The number of online buyers begins to plateau) is not a major trend in online retail for 2017-2018 since the developments in technology and globalization have led to an increase in online purchasing and competition, without any evidence of a plateau in the number of online consumers.
Step-by-step explanation:
The question "Which of the following is not a major trend in online retail for 2017-2018?" explores trends in online retailing. Looking at the provided options and the context of ongoing developments in the retail sector, it seems that the correct answer would be D) The number of online buyers begins to plateau. This is because all other options represent trends in line with the escalating usage of online shopping platforms.
Option D is not consistent with the trends discussed in the context, where we observe an ongoing increase in online purchasing influenced by advancements in technology and the rise of globalization. This has resulted in a broader reach for retail markets, thereby escalating competition and market participation rather than causing any plateau in the number of online buyers.
It is also noteworthy to mention the impact of companies like Amazon that have transformed consumer selling, buying, and consuming patterns, which underscores the continuous expansion of e-commerce rather than a stagnation in the number of online buyers.