Imagine receiving a wedding invitation, that says:
We would like to seat you at a table with good company. So please say which table you would like to sit at for the Wedding Breakfast
We will have a few larger tables, including one for his family and family friends, one for her family and family friends.
There may be some smaller tables, for special groups. Possibly a table for her work friends, one for his work friends, one for people from their gym, and one for their cycling friends. But we will only have each of those smaller tables if there are enough people wanting to sit there.
If you choose one of the smaller tables, but there are not enough people to fill it, we won’t have a table for that group at all and we will cancel your invite.
Whoa you say, that is not very friendly.
It would be more friendly and normal to say:
If you choose one of the smaller tables, but there are not enough people to fill it, we will place you at one of the larger tables. Please say which you would prefer, with his family or her family.
That demonstrates the difference between the present and proposed MMP systems. If you can’t give someone what they would prefer, do not reject them entirely, as at present. it is better to offer them a second choice.
Two-choice party voting 