Plaid Cymru leader Ieuan Wyn Jones hit the campaign trail with Assembly candidate Ron Davies on Monday.
Wyn Jones spoke to traders at the re-opened Caerphilly Indoor Market in Pentrebane Street.
Plaid’s South Wales East candidate and Caerphilly Council leader Lindsay Whittle was also present.
Ron Davies said: “The market had been shut for more than a decade so its reopening was a huge boost and increased confidence in the town centre. I’m sure everyone wants to see a bustling Caerphilly.
“Caerphilly Council worked extremely hard to help the market reopen and the two brothers deserve enormous praise for their bold decision.
“Plaid has agreed to invest in a Regeneration Investment Fund during the next Assembly term and the money will be used to promote sustainable investment creating growth and jobs in town centres like Caerphilly, Ystrad Mynach and Bargoed.
“Plaid wants to see other successful ventures developed. Plaid plans to create a Welsh Growth Fund in partnership with the private sector to provide a £90 million fund to enable small businesses to grow.
Plaid leader Ieuan Wyn Jones said: “Labour’s lack of ideas and lack of ambition for Caerphilly is shocking. Despite weeks of campaigning we still haven’t heard anything from them about how they will improve our education or health services, and how they plan to develop the economy for the next generation.
“For a party which has held power for so long in this area, their lack of vision and ambition is tragic. Caerphilly cannot afford to reward Labour failure by giving them a free hand to manage decline for the next five years. Our people and our communities deserve so much more, and Plaid Cymru is the only party which believes that a better Wales is possible.”