Diffrence between lower and lesser

[Tooto]

Business Idiom in English, Intermediate level

ESL/EFL Test #168 "Poverty in the US: living standards expressions", question 9

The shift from two-parent families to single-parent families and other non-family arrangements tends to ......... average family income.

(a) slighter
(b) smaller
(c) lesser
(d) lower

Business Idiom in English, Intermediate level

ESL/EFL Test #168 "Poverty in the US: living standards expressions", answer 9

The shift from two-parent families to single-parent families and other non-family arrangements tends to lower average family income.

Correct answer: (d) lower
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whats the diffrence between "lower/ lesser?

Tooto

[Hieupt]

We need a verb for this place.

"Lower" can be "verb" or "adj"...
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Thank you very much,
Hieu Phan.

P/s: Please just correct if I'm wrong somewhere!