What are the three main types of expenses?

What are three main types of expenses in accounting and business are fixed expenses, variable expenses, and periodic or discretionary expenses, also categorized as operating, capital, and financial. Three main types of expenses include fixed expenses, which are expenses that remain constant regardless of sales or production volume, including rent, mortgage, insurance premiums, and salaries for permanent staff, with fixed expenses around $1,000 to $5,000 per month for small business, and variable expenses, which are expenses that change with sales or production volume, including cost of goods sold, raw materials, packaging, and sales commissions, with variable expenses increasing as sales increase, and periodic or discretionary expenses, which are expenses that occur irregularly or are optional, including maintenance, marketing campaigns, travel, and entertainment, with businesses budgeting for these quarterly or annually. Another classification includes operating expenses for day to day business, capital expenses for long term assets like equipment and buildings depreciated over years, and financial expenses including interest and taxes. In personal finance, three main types include needs including housing, food, utilities, wants including entertainment and dining out, and savings and debt repayment. So three main types of expenses are fixed expenses like rent and insurance that stay constant, variable expenses like cost of goods sold that vary with sales, and periodic or discretionary expenses like maintenance and marketing that occur irregularly, with alternative classification as operating, capital, and financial expenses for business accounting.