"All of us have a blind spot when it comes to other people's expenses"
Kristine,
How right you are on this one! I would also add that, without records, most people tend to underestimate how much their day to day general expenditure actually amount to.
For example, Quicken has been our main tool for many years for recording purposes. Simply recording your spending habits over a long period can serve to be sobering exercise, when it's all there in black and white- exactly HOW MUCH you really spend on food, entertainment, education etc for the week/month/year.
Back in my more organised days (pre children!) I would calculate the average amount spent in a category (eg: groceries) and keep this amount aside per week in cash. The challenge was not to exceed it. Any leftovers went straight into our PPOR loan at the time.
The trouble was, of course, that certain periods meant that you spent more (Xmas, more visitors than usual etc) so it really didn't work for too long, as I ended up "borrowing" money from other categories, and I have since discovered the joy of credit cards
(paid off in the interest free period of course!)
After doing this for some years, I was always amused by other people's "estimations" of how much they thought they spent, per week, on groceries, for example. In most cases, it was always way under what they actually spent, as without record keeping you are simply guestimating, based on your last Woolies receipt or two.
People will always justify the purchase of something they like/want, even if the running costs (eg; pool, garden, electricity) are high, as they are not "in your face" or consistent. It's easy to remain blind to such costs, until the bills start mounting up
As for children and phones, I can remember my brother racking up one enormous landline bill years ago and the shock my dad got when the bill came. He was ropable!
Acquaintances of ours many years ago had a payphone installed for their chatty teenagers, whilst friends had a moneybox by the phone for all outgoing calls. This may seem like over-the-top measures, but they seemed to work!
As for mobiles, none of my children will be having one unless they've paid for it and the pre-paid cards! We got by pretty well without them when we were teenagers, so I really don't see the necessity for our kids to have them at all. Perhaps not all of us have to follow the herd.....