Standardize

Two of the oldest 'technologies' and they have still not standardized it.
Pity!

I am of course talking of electrical power sockets.
Every traveler knows this.
Why on earth should the sockets in different countries be of different sizes and shapes?
Can't it be standardized?

Purchasing shoes for my family if I happen to see a good one while traveling out of India is another pain.
Take for example, my shoe size.
It is 7 in UK, 8 in US, and 40.5 in Europe.
Why???