The Seven Penny Rule

The WFRP First Edition rulebook states that 7/- a day is the minimum cost of an acceptable standing of living.
Anyone spending less than 7/- a day on subsistence is clearly on the decline and will begin to lose social standing within his peer group. Thus a character will lose one Social Standing Point for every day he fails to satisfy the 7/- Rule.
If his Social Standing drops to zero he will also drop a Social Class and starts again with 1D4 Social Standing Points in the lower class.
Anyone who drops to Class D with a Social Standing of Zero is immediately classed as a beggar.
Nobility must spend 7/- per day per Social Standing Point in order to maintain their social position as it is particularly expensive to keep up appearances amongst the nobility.

Homebrew Rules

Whilst WFRP First Edition states that an acceptable standard of living costs 7/-, it is clear the from Second Edition onwards the WFRP economy has been substantially reworked and it's coinage revalued.  WFRP Fourth Edition has continued this theme and players now equate 1d as approximately equal to one euro or one pound in today's money.
This new Poundland style economic model really work with a cost of living set at seven shillings a day and so I have decided to devalue the economy of my world to bring it more into line with my player's assumptions based upon WFRP 4th Edition.  Thus 7/- a day has been reduced to 7d a day.
All characters in Class B, C or D will now need to find 7d a day to maintain their social standing.  Whilst those with special abilities to 'make do and mend' like the Stone Soup skill can reduce this still further to 4d a day with the permission of the GM.
The Gamemaster may make certain adjustments to the 7d Rule to account for a characters specific situation.

• If the character owns a horse, mule, donkey, pet or familiar the GM may decide that an additional payment is needed to look after them as well as the characters needs.
• If the character owns specific types of weapons, equipment or tools that logically would require special care to keep in good working order the GM may decide that the cost of maintenance should be added to the 7d rule.
• If a character becomes ill or injured in such a way that specialised care or diet is needed then the GM may decide that this increases the cost of living.

These adjustments will be discussed and agreed with the player in advance.

Travelling in the Wilderness

Characters may accumulate up to 10 days of credit against the 7d rule before setting out on a journey. This is the equivalent of buying additional days rations and essentials before leaving town. This will avoid losing social standing whilst living in the wilderness.
Characters who fail to do this will simply lose one social standing point per day whilst they are unable to look after themselves and will eventually return to civilisation looking far less civilised than when they left. e.g. dirty, dishevelled and hungry. However, this is nothing that a hot bath, good meal and a quick change of clothing cannot put right the cost of which will be 1/- per standing point lost.