To stop spreading the virus China they lock down the entire city and it slows the spread somewhat. Cannot image this can be done in a democratic society of large cities in US or Europe.

You can't put a ban in place before there's a reason to put a ban in place. And by then, it's too late. What's more ... people will try to sneak out of the city.
... That can make it much harder to track potential cases and contact, which is one of the most effective ways to contain this outbreak.

A dozen towns ... were put in lockdown (and were made so-called “red zones” and quarantined) just over a week ago as the Italian government under Prime Minister Giuseppe Conte sought to halt the spread. The measures are due to be in place until at least March 8.
There are other “yellow zones” in Italy where schools are closed, and sports events and religious and cultural spaces have been postponed or canceled.

The Adviser is entitled to receive a monthly fee at the annual rate of 1.85% of the Fund’s daily net assets. [There is a management agreement] to waive its fees and to pay or absorb the ordinary operating expenses ... to the extent that such expenses exceed 2.60% and 3.35% per annum of the Fund’s average daily net assets ... attributable to Class A and Class C shares, respectively

Supplies fly off shelves in Bay Area as coronavirus spreads
Bare shelves and frayed nerves were on full display over the weekend at Bay Area grocery stores as the coronavirus continued to spread.
Shoppers described chaotic scenes, many of which were shared on social media: stacks of rice and toilet paper snatched up within seconds, checkout lines that snaked through entire stores, and jam-packed parking lots reminiscent of Christmas Eve.
It’s the latest ripple effect of the outbreak of a still mysterious respiratory illness that in the past two months has caused more than 88,000 people around the world to fall ill. The virus that only a few weeks ago was mostly confined to China now has recorded cases in more than 60 nations.
According to figures compiled by Johns Hopkins University, the number of fatalities from the illness rose to more than 3,000 on Sunday. More than 2,800 are in China, where the outbreak originated. The first American fatality occurred Saturday in Washington state, and a second death was reported there Sunday.
With numbers climbing and no vaccine available, institutions such as the World Health Organization and the United States’ Centers for Disease Control and Prevention in recent days have warned that people should be prepared for a pandemic situation, including the possibility of having to stay confined in their homes for one or two weeks.
The results of that warning could be glimpsed in the depleted shelves and long lines in stores this weekend.
[At a local Costco] dozens of cars snaked around the block, waiting to enter the parking lot. Shoppers lugged jugs of water and emergency supplies, since there wasn’t a single shopping cart left to grab.