Adequate income, very interesting question.
Income is a changing need depending on what the household is doing /lifestyles etc.
I was on a very stable income £2000 a month , on this I managed to feel stable, secure ( able to save a little) we had a good balanced diet , one holiday abroad each year with several trips around the UK.
This was my adequate income because I could provide things like clubs, subscriptions, lessons etc for my children. We enjoyed going out for leisure, meals, cinemas etc. we spent within our limits and had little money worries.
So I suppose having a regular adequate income could provide what I have mentioned for a household.
Unfortunately I lost my income and survived on very little ( £600 per month for two years )
I did not want to face humiliation from benefit system and was too sick to work.
I spent time on my recovery to get a suitable dignified job that I am happy in and now have a salary.
The change in my income brought on a whole set of new issues which I had to deal with at the same time trying to heal myself . This in itself took a humongous amount of willpower , determination and resilience. Big Hurdles...still not living on an adequate income. I feel this will take some time for me to reach.