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O estoque representa uma parcela considerável do total de investimentos de uma empresa. Ele pode ser composto por produtos acabados, produtos em fabricação, matérias-primas ou peças de reposição. Em qualquer caso, a gestão e o controle adequados são fundamentais para evitar prejuízos e garantir vantagem competitiva à empresa.
A projeção do estoque ideal deve levar em consideração o volume de vendas de cada item, pois produtos parados representam custos de manutenção e perda de rentabilidade — trata-se de um capital imobilizado que poderia alcançar melhores resultados em outras aplicações. Por outro lado, estoque em falta afasta clientes e dificulta a fidelização.
Acertar essa conta não é uma questão de feeling. Para facilitar a gestão de estoques e investir sempre o estritamente necessário, você precisa se basear em números.
Quer conhecer uma ferramenta indispensável nesse trabalho? Aprenda como fazer uma curva ABC e melhorar a gestão do seu estoque agora mesmo!
O que é uma curva ABC?
Trata-se de um método de classificação que separa os itens de um estoque considerando três diferentes níveis de impacto: A, B e C. A medida desse impacto é obtida, basicamente, pelo cruzamento das informações sobre volume de vendas em quantidade e valor.
Assim, a importância de um grupo de produtos será equivalente à sua participação no faturamento total da empresa. Para elaborar essa matriz, a curva ABC considera a teoria econômica de Vilfredo Pareto.
De acordo com esse princípio, há uma regularidade entre esforço e resultado que sempre respeita a média de proporção 80/20: ou seja, 80% dos resultados são originados por 20% dos esforços, e vice-versa.
Aplicando o conceito à gestão de estoque, consideramos que 20% dos itens de um estoque são responsáveis por 80% do faturamento, logo são mais importantes e devem receber a maior parte do valor investido no negócio. Os demais 80% de itens do mix possuem importância menor ou intermediária, devendo receber esforços correspondentes ao retorno.
Note que, nessa análise, um item é representado por um produto que pode ter quantidades variadas no estoque. Menos itens, portanto, não significam necessariamente menos quantidade.
Seguindo essa lógica, em uma curva ABC os itens do estoque são classificados conforme os seguintes níveis:
Nível A: são os itens de maior importância. Representam, em média, 20% do total de itens presentes em um estoque, responsável por até 80% das vendas.
Nível B: são os itens de importância média. Representam, em média, 30% do total de itens presentes em um estoque, responsável por uma média de 15% das vendas.
Nível A: são os itens de menor importância. Representam, em média, 50% do total de itens presentes em um estoque, responsável por uma média de 5% das vendas.
Como montar uma curva ABC?
Em primeiro lugar, você deve construir uma tabela que relacione cada produto com sua respectiva quantidade média vendida, valor unitário e valor total de vendas (quantidade média x valor unitário). O período de análise deverá ser definido conforme a sua realidade: semanal, quinzenal, mensal, bimestral, e por aí vai.
Um exemplo:
CÓDIGO
PRODUTO
Valor unitário
Vendas/mês
Valor total/mês
001
alicate
R$25,00
80
R$2.000,00
002
parafuso
R$0,50
200
R$100,00
003
chave inglesa
R$8,00
50
R$400,00
Depois, você vai relacionar o valor total de vendas de cada produto com o faturamento total da empresa no período, obtendo a porcentagem de participação de cada item nas contas da empresa.
Vamos supor que o faturamento bruto da empresa representada acima seja de R$2.500,00 mensais.
Isso significa que o item alicate representa 80% das vendas, portanto, categorizado na curva ABC como nível A.
A chave inglesa, por sua vez, representa 16% das vendas, sendo classificada como nível B.
Já o parafuso, embora vendido em maior quantidade, representa apenas 4% das vendas — pertence, portanto, ao nível C.
Nesse exemplo, usamos apenas 3 itens para facilitar o entendimento. Mas, quando você finalizar a lista com todo o mix do estoque, essa análise será um pouco mais complexa:
A soma dos produtos com maior faturamento, que juntos representam 80% do faturamento total, será categorizada como nível A.
A soma dos produtos com faturamento médio, que juntos representam 15% do faturamento total, será categorizada como nível B.
A soma dos produtos com menor faturamento, que juntos representam 5% do faturamento total, será categorizada como nível C.
Como os dados da curva ABC podem me ajudar?
Com os itens do estoque devidamente categorizados, a tomada de decisão de compra de mercadorias pode ser orientada por dados mais concretos. Confira algumas vantagens desse método:
Compreensão do perfil do consumidor
Esse levantamento fornece uma noção geral de perfil de público muito útil para orientar estratégias de marketing. Qual o ticket médio dos clientes mais importantes? Com qual frequência compram? Quais seus hábitos de consumo, preferências e necessidades? Como é possível atendê-los melhor?
Essa visão ajudará a traçar melhores estratégias de conquista e fidelização, bem como melhorar o treinamento dos vendedores e indicações de itens para venda adicional.
Gestão de demanda
Conhecendo o impacto de determinados produtos no faturamento da empresa, você saberá quais não podem faltar sob nenhuma hipótese. Assim, será fácil reforçar o controle e estabelecer as previsões de demanda ideais para orientar o departamento de compras, distribuindo os investimentos de maneira uniforme.
Redução de custos
Quando o volume de compras não respeita as proporções da curva ABC, corre-se o risco de ficar com parte do estoque parado por muito tempo. Os custos envolvidos nesse armazenamento são diversos:
Custos relativos ao espaço físico utilizado: aluguel, seguro, impostos, etc.
Custos relativos à conservação: contas de energia e água para manter refrigeração, por exemplo.
Custos relativos ao manuseio: compra e manutenção de maquinário envolvido na manutenção e reposição.
Custos relativos à mão de obra: valor/hora de funcionários envolvidos na gestão de estoque.
Custos relativos aos riscos: depreciação, obsolescência, furtos e roubos, etc.
Assim, quanto menor o estoque parado, menores os custos absorvidos pela empresa.
Mais competitividade
A redução de custos pode impactar diretamente o preço de venda dos produtos, garantindo a preferência do consumidor e maior competitividade da empresa no mercado.
Mais recursos disponíveis para investir no negócio
Muitas vezes, ao observar as contas da empresa, a conclusão é imediata: não há dinheiro para nada! No entanto, a redução de custos proporcionada pela otimização do estoque pode liberar verbas importantes para o sucesso do negócio, como investimentos em mídia, treinamento, softwares de gestão, entre outros. Você pode se surpreender com o resultado!
Para finalizar, atenção: a curva ABC não é estática. Ela deve ser revista conforme a variação de produção e comercialização de determinados itens. A falta de otimização constante da cadeia logística pode aumentar os custos a ponto de inviabilizar toda a operação.
Caso tenha dificuldades com esse gerenciamento e o volume de itens comercializados seja muito grande, não deixe de contar com uma consultoria especializada.