When things get tight, resist the urge to secure your business finances with personal funds because it will surely create a mess you will have to deal with later on. (thebalancesmb.com)
During this time, however, it's best practice to stop using joint cards and make future purchases using personal funds. (valuepenguin.com)
However, reports have been made by several highly successful traditionally published authors that they did invest personal funds in their own marketing campaigns. (midnightpublishingllc.com)