'offer' : if the offer made is in monetary terms - I made him an offer of $4000 for his old car - then I [B]increase[/B the offer to $4200.
Say an employer has offered redundancy packages to workers in its administrative sections. Say few people take up the offer, and the company still needs to reduce its staff. It might then broaden the offer of redundancy packages to include workers in middle management.
Use 'increase' when it is 'more of the same'.
Use 'broaden' when the change means that the offer spreads to include other people, other groups, other areas of activity.
Similarly, if a car maker opens a new plant in an area, then there are increased opportunities for employment in the area.
A work re-training centre offers retraining courses in bread-baking and bookkeeping. It starts up new courses in secretarial work, car maintenance, and gardening, and so aims to broaden opportunities for the unemployed young and old to enter the workforce.
Student or Learner