Wash it please

A man comes home at the evening after the work. His wife meets him, kisses
him. The man is surprised with a such sudden change. He sits at a table in
kitchen, but the wife informs him:
"Honey, our ratio�s transfer to the market ratios. Supper costs $5."
The husband has estimated and decided it isn't too expensive. He has agreed.
The wife lays the table. The husband pays off. After the supper he gives a shirt
to her and says:
"Wash it, please."
"It costs $3" the wife answers.
The husband pays $3 to her. The wife washes. The time for going to bed. The
man touches his wife, but she says:
"It costs $10."
"But I have only $7 left" the husband responds, turns back and asleep.
The man wakes up at the night because of the noise. He sees a light in all
rooms. His wife looking for something in a handbag. He asks her:
"What are you looking for?"
"I am looking for $3 to lend you."